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After picking up titles in the Middle East, Karolina Pliskova and Elina Svitolina seem to have all the momentum as the tour heads to Indian Wells and Miami. But how do their performances stack up against the year’s other top performers?

In this edition of WTA Insider Heat Index, Senior Writer Courtney Nguyen weighs in on who’s hot and who’s not after a fortnight in Dubai and Doha.

For more on the Heat Index and the methodology behind it, click here.

1. Serena Williams (Rank: No.1; RTS: No.1; Previous HI: 1)
2017 record: 8-1
Titles: Australian Open (January)
Recent activity: None.
Key Stat: Did not lose a set in Melbourne.

Serena has not played an event since winning her record-setting 23rd major title at the Australian Open in January, but given her propensity for party crashing some public courts, I’m guessing she’s still healthy and in good spirits. That bodes well for the upcoming Sunshine Double swing through Indian Wells and Miami.

2. Karolina Pliskova (Rank: No.3; RTS: No.3; Previous HI: 2)
2017 record: 15-2
Titles: Brisbane International (January), Qatar Total Open (February)
Recent activity: Doha champion.
Key Stat: The first woman to win two titles this season.

The World No.3 has looked virtually unbeatable in 2017. When it comes to quality wins, no one has been better. Two months into the season and Pliskova already has wins over Dominika Cibulkova, Caroline Wozniacki, Garbiñe Muguruza, and Elina Svitolina.

3. Elina Svitolina (Rank: No.10; RTS: No.2; Previous HI: No.8)
2017 Record: 17-2
Titles: Taiwan Open (February), Dubai Duty Free Tennis Championships (February)
Recent activity: Taiwan Open champion, Dubai champion.
Key Stat: Currently on a 13-match winning streak since the Australian Open.

This is what we were waiting for. After tallying five career titles on the International level and improving her year-end ranking year over year, Svitolina put it all together in Dubai to win the biggest title of her career and make her Top 10 debut. With her third straight win over Angelique Kerber, she ended the German’s quest to retake the No.1 ranking and followed it up with a cool performance to beat Caroline Wozniacki in the final.

4. Caroline Wozniacki (Rank: No.14; RTS: No. 5; Previous HI: Unranked)
2017 record: 15-5.
Titles: None.
Recent activity: Runner-up in Doha and Dubai.
Key Stat: Wozniacki already has 15 wins this year. Her 15th match win last year came at the US Open in September.

Is Woz back? It sure does seem that way. The Dane made back-to-back finals in February in Doha (l. Pliskova) and Dubai (l. Svitolina) and she’s continued the fantastic run of form that’s kicked in since the start of the US Open last fall. In fact, if you isolate the ranking points earned since the start of the US Open, Wozniacki is at No.3 behind Kerber and Pliskova. Wozniacki has beaten just one Top 10 player so far this season, a win over Agnieszka Radwanska in Doha, but with less than 200 points to defend from no until the US Open, there’s no doubt a return to the Top 10 — Top 5? — is coming soon.

5. Johanna Konta (Rank: No.11; RTS: No.6; Previous HI: No.2)
2017 record: 15-3
Titles: Apia International Sydney (January)
Recent activity: Went 3-1 in Fed Cup (l. to Konjuh)
Key stat: Konta’s win over Radwanska in the Sydney final was her first over a Top 5 player in over a year.

Konta took her good form into Fed Cup and helped earn Great Britain a chance at promotion to the World Group. A foot injury prevented her from making her debut in the Middle East in Dubai, but with plenty of rest before the upcoming hard court swing, Konta should be in good form.

6. Angelique Kerber (Rank: No.2; RTS: No.9; Previous HI: No.6)
2017 record: 7-5
Titles: None
Recent activity: Dubai semifinalist.
Key stat: Kerber is 0-5 vs. Top 35 players.

After a disappointing January, Kerber showed signs of life in Dubai, playing cleaner, more aggressive tennis to make her first semifinal of the year. The quality was a step in the right direction. I still maintain it’s too early to write off the woman who won two hard court Slams last year. Now, if she continues to struggle through March…then it’s time to have the discussion.

7. Dominika Cibulkova (Rank: No.5; RTS: No.5; Previous HI: No.11)
2017 record: 8-6
Titles: None
Recent activity: Doha semifinalist.
Key stat: Made back-to-back semifinals in St. Petersburg and Doha.

The Middle East swing was a mixed bag for Cibulkova. She lost to eventual champion Pliskova in Doha, but in Dubai she was confounded once again by Ekaterina Makarova, who also beat her at the Australian Open. But much like Kerber, the level of tennis she played was an improvement on what we saw in January and she’s put in extra work with her mental coach to help her deal with the expectations of being a Top 5 player. She started to feel like herself again after Doha, and that’s good news for her tennis.

8. Agnieszka Radwanska (Rank: No.6; RTS: No.16; Previous HI: No.5)
2017 record: 7-5
Titles: None
Recent activity: Lost in Round of 16 in Doha (l. Wozniacki) and Dubai (l. Bellis)
Key stat: Has not won back-to-back matches in her last three events.

After solid outings in her first two tournaments of the year, the World No.6 has struggled to find her confidence and feel. Remember, this is a player who made the semifinals or better of her first four events last season. Her inability to solve 17-year-old CiCi Bellis in Dubai was a shocker. She’s frustrated and searching.

9. CoCo Vandeweghe (Rank: No.22; RTS: No.7; Previous HI: No.7)
2017 record: 8-3
Titles: None
Recent activity: Went 2-0 at Fed Cup; first round loss to Alison Riske in Dubai.
Key stat: Vandeweghe beat Kerber and Muguruza at the Australian Open. It was just the second time in her career she’s beaten two Top 10 players at a tournament (2014 Rogers Cup, Ivanovic and Jankovic).

The question for Vandeweghe after the Australian Open wasn’t whether she had Slam-winning tennis inside her — the quality during the Melbourne fortnight was top-notch — but whether she could maintain a consistent level. Indian Wells and Miami should serve as better litmus tests.

10. Kristina Mladenovic (Rank: No.30; RTS: No.14; Previous HI: Unranked)
2017 record: 8-4
Titles: St. Petersburg
Recent activity: Beat Pliskova in Dubai, semifinalist in Acapulco (tournament ongoing).
Key stat: Her win over Pliskova was her first Top 5 win since 2015.

Mladenovic will be the first to tell you her tennis can reach the highest of highs and, at times, head-scratching lows, but it makes her game all the more compelling. After winning her first title in St. Petersburg, Mladenovic scored a big win over Pliskova only to lose to No.76 Wang Qiang in straight sets the next day. Regardless, she’s been consistently dangerous early this season.

11. Garbiñe Muguruza (Rank: No.7; RTS: No.10; Previous HI: No.4)
2017 record: 9-5
Titles: None
Recent activity: Went 1-2 during Middle East swing.
Key stat: Two of her four tournaments this season has ended in a retirement.

The primary reason surrounding Muguruza’s notable drop in the Heat Index is injury related. She picked up a left Achilles injury in Doha, which forced her to retire from a match in Dubai for the second time this season. In January she retired from the Brisbane semifinals due to an abductor injury. It’s a disconcerting trend for the Spaniard, just two months into the season.

12. Venus Williams (Rank: No.13; RTS: No.4; Previous HI: No.10)
2017 record: 7-2
Titles: None
Recent activity: None
Key stat: This time last year, Venus was also 7-2. She lost in the first round of Auckland and the Australian Open before winning seven straight matches at Fed Cup and en route to the Taiwan Open title.

With the surges from Wozniacki and Mladenovic into this edition of the Heat Index, Venus drops two spots. She did not play a tournament in February, so I’m looking forward to seeing how she’s feeling in Indian Wells next week. If it’s anything like what we saw in Melbourne, it will be a treat.

1. Who is healthy?

Top seed Angieszka Radwanska reclaimed the World No.2 ranking last week when reigning Australian Open champion Angelique Kerber failed to defend her title at the Volvo Car Open. Arguably the most consistent player of the last six months, Radwanska has reached the semifinals or better of all but one of her five WTA appearances in 2016 – that being a hard-fought Miami Open loss to eventual semifinalist Timea Bacsinszky in the round of 16.

However, all of those matches might be catching up with the Pole, who withdrew from her home tournament in Katowice and the Fed Cup World Group II Play-off due to a right shoulder injury. Heading onto what has traditionally been her least successful surface, Radwanska has few points to defend through the French Open, winning just two matches during last season’s clay court swing.

Click here to check out the Stuttgart draw.

Still, Stuttgart’s notoriously stacked draw means she will have to hit the ground running after a first round bye, facing one of two Fed Cup heroines in Andrea Petkovic and Kristina Mladenovic. No.8 seed Lucie Safarova, Karolina Pliskova, and 2008 French Open champion Ana Ivanovic are all possible quarterfinal opponents.

With far more to defend ahead of the second Grand Slam of 2016 is former French Open finalist Simona Halep. One of the most natural clay court players in the field, the Romanian reached the semifinals of Stuttgart and Rome, but admitted to picking up a left ankle injury in her three-set win over Andrea Petkovic in Fed Cup. Unsure if she would play her second match against Germany on Sunday, Halep won only four games against Kerber, who had never beaten Halep in three previous encounters.

Seeded fourth in Stuttgart, the former World No.2 will have a few extra days ot recover, but is in a section full of dangerous floaters like Anastasia Pavlyuchenkova, 2011 champion Julia Goerges, Alizé Cornet and Ekaterina Makarova. No.6 seed Roberta Vinci rounds out the top half of the draw.

2. Can Kerber and Suárez Navarro rebound on red clay?

Kerber won the second of four Premier titles in Stuttgart last year, outlasting an in-form Caroline Wozniacki in three grueling sets. The German shook off a minor post-Melbourne slump to reach the semifinals in Miami and Charleston, where a viral illness forced her to retire against Sloane Stephens. More at home on faster surfaces, Kerber can still get things down in Stuttgart’s slow conditions; seeded second, she’ll play either a qualifier or countrywoman Annika Beck, whom she beat en route to her Australian Open title.

Her possible quarterfinal opponent could be another Aussie redux in semifinalist Johanna Konta, but all eyes will be on No.7 seed Carla Suárez Navarro. The story of the season’s first six weeks, Suárez Navarro rocketed up the rankings with a solid Middle Eastern Swing and a title in Doha, but an ankle injury halted her momentum and her inability to defend her Miami Open points caused her to fall from No.6 to No.11.

A finalist last year in Rome, the Spaniard had few problems in Fed Cup, dropping just two games against Roberta Vinci. She may trail Kerber in the overall head-to-head, but their only clay court meeting came two years ago in Stuttgart. The winner? Suárez Navarro, in straight sets.

3. Will Garbiñe Muguruza bring her Fed Cup form to Stuttgart?

Despite a slow start to 2016, Muguruza appeared to be putting the pieces together in Miami, playing one of the best matches of the year against former No.1 Victoria Azarenka. Traveling to Lleida for a relegation Fed Cup tie against the once unstoppable Italians, the Spaniard made a seamless transition to the terre battue with a pair of straight set victories over 2010 French Open champion Francesca Schiavone and Vinci, whom she defeated, 6-2, 6-2.

Known for her breakout run to the 2015 Wimbledon final, Muguruza is perfectly capable on clay, having twice made the quarterfinals of Roland Garros – defeating World No.1 Serena Williams in the second round back in 2014. The No.3 seed in Stuttgart, she will open against Sabine Lisicki or Timea Babos, a fast-rising Hungarian who nearly upset Kerber under the lights in Miami.

No.5 seed Petra Kvitova is her projected quarterfinal opponent, but Monica Niculescu or Caroline Garcia could just as easily take their own impressive form from Fed Cup to take out the two-time Wimbledon winner.

4. Which hometown favorite is poised for a breakout run?

Though Germany boasts six women in the Top 60, only four may be eligible for the Olympic Summer Games; with less than two months before the teams are selected, the results through the clay court swing will be crucial to determining which women make the cut to qualify for Rio.

How tight is the race for the German Olympic team? As of April 18th, No.4 and No.5 Sabine Lisicki and Anna-Lena Friedsam are separated by just two places in the WTA rankings, at No.50 and No.52, respectively. Not too far behind at No.59, Julia Goerges is in the midst of a stellar season, having already reached a final in Auckland and another in doubles at the BNP Paribas Open.

All six women are in action this week in Stuttgart, led by Kerber and Petkovic, who are the only two ranked inside the Top 30. Goerges defeated then-No.1 Wozniacki to win the title here in 2011, while Lisicki will be hard-pressed to turn around a disappointing start to her season. Will any make strides towards those coveted Olympic spots?

5. How will Santina fare as they search for a second wind?

Martina Hingis and Sania Mirza began this season much as they ended the last, roaring through back-to-back titles in Brisbane, Sydney, Melbourne, and St. Petersburg before their 41-match winning streak came to an end in Doha. Since narrowly losing to Daria Kasatkina and Elena Vesnina in a match tie-break, Santina have been unable to string together wins, losing in the round of 16 in both Indian Wells and Miami – titles they won to cement their partnership in 2015.

Opting against the trip to Charleston, Hingis and Mirza look to regain their mojo as they aim to achieve their ultimate goal of a fourth straight major tournament, a “Santina Slam.”

Playing on their least favorite surface, the co-No.1s should be able to play their way into form in the 16-team draw with only four seeds. Their biggest opposition looks to be No.2 seeds Caroline Garcia and Kristina Mladenovic. The French Connection swept the Charleston title in Santina’s absence – defeating reigning French Open champions Bethanie Mattek-Sands and Lucie Safarova in the final – and battled through a decisive doubles rubber to send France into the Fed Cup final on Sunday.

Under the radar is the unseeded Kveta Peschke. The former No.1 and 2011 Wimbledon champion is playing her first tournament since last year in Dubai; pairing with Anna-Lena Groenefeld, Peschke will open against No.4 seeds Raquel Atawo and Alicja Rosolska.

All photos courtesy of Getty Images.