The US Open title is up for grabs as top seed and two-time champion Novak Djokovic is battling third seed and two-time major winner Stan Wawrinka. The Serbian took the first set 7-6(1) and the Swiss pulled level with a 6-4 second.

Djokovic is appearing in his 21st Grand Slam final, passing Rafael Nadal for solo second place on the Open Era list. He is vying for a 13th title, which would put him one behind Nadal and Pete Sampras.

Entering with a perfect 2-0 record in Grand Slam finals, Wawrinka is seeking his 15th title at the tour-level. The 31 year old is looking to become the fifth man in the Open Era to win two or more major singles crowns after turning 30, joining Rod Laver, Ken Rosewall, Andre Agassi and Jimmy Connors.

Djokovic leads the FedEx ATP Head2Head 19-4, but Wawrinka has taken two of their past three Grand Slam meetings, including the 2015 Roland Garros final. In addition, four of their past five major encounters went five sets.

Here is how the final is unfolding…

SET ONE – Djokovic 7-6(1)
Warm and overcast conditions greeted Djokovic and Wawrinka on Sunday afternoon at Flushing Meadows, with the brutal humidity that plagued the tournament earlier in the week dropping significantly as the Serbian and the Swiss took to Arthur Ashe Stadium.

Wawrinka, who had won his past 10 tour-level finals, had his game plan. The World No. 3 hammered his backhand with aplomb in last year’s Roland Garros final against Djokovic, breaking down the Serbian’s defenses. With this year’s US Open courts playing slower than usual, Wawrinka had more time to set up his penetrating groundstrokes, which generated more than double the winners (157-70) throughout the fortnight.

But Djokovic had other plans from the start. Much like he did against Kei Nishikori in the semis, Wawrinka started slow, and the two-time US Open champion took full advantage in the early proceedings.

The World No. 1 broke Wawrinka from 40/15 down in the Swiss’ first service game and consolidated for a 3-0 lead. An outrageous point saw Djokovic deny a pair of forehand winners with his elastic defense from well behind the baseline. A lunging backhand stab landed smack on the far tramline and Wawrinka had no response.

Following a hold to love for 5-2, Djokovic looked to wrap up the set in efficient fashion, holding a pair of set points with Wawrinka serving at 5-3. But Wawrinka raised his game to match his counterpart, turning aside both chances and denying Djokovic’s bid to serve out the set a game later. The Swiss would hold for 5-all, suddenly turning the tide with a run of 12 of 15 points.

The set would proceed to a tie-break, where both competitors provided arguably the point of the tournament, a 19-shot rally that saw them produce a stunning shotmaking display of precision, power and finesse. Wawrinka would win the point, but that would be all the Swiss could muster in the tie-break as Djokovic took it 7-1 after 58 minutes.

SET TWO – Wawrinka 6-4
With musicians Paul Simon and Tony Bennett, actor James Spader and fashion icon Anna Wintour in attendance on a star-studded early evening in New York, Djokovic looked to extend his lead.

The Belgrade native is 51-0 when winning the first set at the US Open, but after taking a physical opener, he let his guard down early in the second. The scintillating down-the-line backhand in the ad court, that earned Wawrinka the title at Roland Garros over Djokovic last year, produced a moment of magic to break for 3-1. Two Djokovic double faults hurt the Serbian’s cause in that service game, and he would fail to capitalise on a 0/40 look at Wawrinka’s serve immediately after.

Coach Magnus Norman has brought a surge of mental strength to Wawrinka’s game in recent years and the Swiss exhibited that steely resolve during the second set. First, he refused to suffer a lapse of focus after dropping a tight opener. Then, he remained poised after conceding the break midway through the set.

The tide would turn in an instant. Serving up 4-2 30/30, Wawrinka decided not to make an attempt on a Djokovic regulation cross-court forehand that clipped the edge of the tramline. It would prove costly, as Djokovic would take his fourth break chance of the set in the next point and eventually draw level at 4-all.

But Wawrinka stayed the course, holding to love for 5-4 and converting his second set point as an off-balance Djokovic pulled a forehand wide at 30/40 in the next game. The Swiss would fire seven winners in the second set, benefiting from 14 Djokovic unforced errors. One set apiece, with a critical third stanza on the way.

It was July 1993. Pete Sampras was embarking on his 286-week reign atop the Emirates ATP Rankings, having claimed his first Wimbledon title.

On the ATP Challenger Tour, a 20-year-old Christian Ruud put Norway on the tennis map as its first titlist. Ruud won back-to-back crowns in Finland and France and would rise to a career-high World No. 39 just two years later.

Fast forward 23 years and the Ruud name is back in the spotlight. On Saturday, Casper Ruud – Christian’s son – rocked the tennis world, capturing his first title in his Challenger debut in Seville, Spain. At 17 years and eight months, he is the fourth-youngest player to win on debut in Challenger history. Only Michael Chang, Richard Gasquet and Jonathan Stark were younger.

Ruud, who opened the season outside the Top 1000, will soar nearly 200 spots in the Emirates ATP Rankings to a projected World No. 273. The former junior No. 1 is the youngest winner on the circuit since Alexander Zverev (17 years, 3 months) in Braunschweig, Germany, in 2014.

Thank u thank u thank u guys!!!! Really I dont know what to say, but I couldn’t be more happy right now, amazing week?????????????

— Casper Ruud (@CasperRuud98) September 10, 2016

Opting to begin his professional journey over culminating his junior career at the US Open paid dividends for the Norwegian teen. Ruud proved his mettle throughout the week, marching through qualifying and winning seven matches in eight days, including four from a set down.

He would earn his first Top 150 win in the second round over Andrej Martin, followed by his first Top 100 win in stunning top seed Inigo Cervantes in the quarter-finals. Then came a comeback victory over defending champion Pedro Cachin in the semis, before downing third seed Taro Daniel 6-3, 6-4 in Saturday’s final. Ruud exhibited the composure of a veteran after letting a set and double break lead slip, holding on for the victory after one hour and 22 minutes.

The Oslo native is one of five 17-year-olds to lift a Challenger trophy in the past four years, joining #NextGen stars Zverev, Borna Coric, Taylor Fritz and Nick Kyrgios. He is also just the third Norwegian to emerge victorious in ATP Challenger Tour history, with his father and three-time winner Jan Frode Andersen.

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Jason Jung may have grown up in California, but he’s been excelling in China on the ATP Challenger Tour.

The 27 year old, who now plays for Taiwan, has posted an 11-15 record this year in Challenger events outside of China, but is now 14-2 at events within the country. He won his first Challenger title last month at the $125,000 event in Qingdao, helping push his Emirates ATP Ranking to a career high of No. 158.

Jung will reach a new career high Emirates ATP Ranking after his performance at the $50,000 Challenger in Shanghai. Coming in as the No. 6 seed, he upset top seed Jordan Thompson in the semi-finals on Saturday, 6-4, 6-4. He’ll play a rain-delayed final on Monday against No. 3 seed Henri Laaksonen of Switzerland.

“Most of my best results are in China and there are so many Challenger tournaments here, so it’s really good for me,” said Jung. “Especially in Qingdao, there were so many fans who supported me so much during the week. I like to have them get involved and could really feel that they were with me.”

His breakthrough year is particularly noteworthy because pro tennis wasn’t even in the cards for Jung when he graduated from the University of Michigan. He took a job at an oil company back home in Torrance, California, but found himself laid off after three months and unsure about what path to take.

“My friend suggested I play a big money tournament in Seattle. I had not picked up a tennis racquet since I finished at Michigan. But I went there and tuned everyone up,” wrote Jung in his ATP Challenger Chronicle blog last month. “I surprised myself. After that tournament, I decided I would make a run at the professional circuit.”

Slowly but surely, Jung has continued to climb up the Emirates ATP Rankings over the past five years. Now that he’s consistently making deep runs in ATP Challenger Tour events, he has even bigger goals in store for next year.

“My serve and my movement have gotten a lot better this year. I have a friend on my team who gave me some advice in those areas and it helped a lot,” said Jung. “I want to make it the Top 100 by the end of the year, but think I just need to continue to play like I have been.”