A two-time US Open champion and a trio of Frenchman will battle it out on Tuesday for two of the four semi-final spots at the US Open.

Top seed and defending champion Novak Djokovic will continue his pursuit of a third US Open title when he meets ninth seed Jo-Wilfried Tsonga. Djokovic had spent just three hours and eight minutes on court in reaching the fourth round, thanks to a walkover and a withdrawal, but he showed glimpses of his best in a straight-sets rout of Kyle Edmund.

Read More: Rested Djokovic Coasts Into QFs

Tsonga is through to the quarter-finals, his 14^th at Grand Slam level, for the second straight year. Only once has he progressed to a Grand Slam final and the man who would deny him at the 2008 Australian Open was the Serbian he next faces. Tsonga was impressive in dismissing Jack Sock in the fourth round but has beaten Djokovic only six times in 21 FedEx ATP Head2Head meetings.

Whoever the victor, a Frenchman will await in the semi-finals with 10^th seed Gael Monfils and 24^th seed Lucas Pouille to clash. Monfils, enjoying his most consistent season to date, won his biggest ATP World Tour title at the Citi Open in Washington, D.C. leading in. He has rolled through his first four matches without losing a set, comfortably dismissing Marcos Baghdatis in the fourth round. Pouille is coming off his biggest career win, a five-set upset of two-time former champion Rafael Nadal.

Read More: Pouille Shocks Nadal In New York

It marks Pouille’s second straight Grand Slam quarter-final, and he will be looking to avenge defeat from his only prior match-up with Monfils, a five-setter in the first round of this year’s Australian Open.

Jamie Murray and Bruno Soares have qualified for the Barclays ATP World Tour Finals, to be held at The O2 in London from 13-20 November. Murray/Soares won their third-round match at the US Open against Brian Baker and Marcus Daniell 6-3, 7-6(7). Jean-Julien Rojer and Horia Tecau’s third-round loss earlier in the day ensured that the British-Brazilian team would qualify for the prestigious year-end championship.

Murray/Soares are currently No. 3 in the Emirates ATP Doubles Race To London. The 2016 Australian Open champions (d. Nestor/Stepanek) own two team titles (2016 Sydney) and have reached the finals of ATP World Tour Masters 1000 events in Toronto and Monte Carlo this year.

Murray will be making his second consecutive London appearance. Last year, he and partner John Peers were eliminated in the group stage. Soares qualified for London in 2013 and 2014 alongside Alexander Peya. They reached the semi-finals (l. to Bryan/Bryan) in 2013.

A LOOK BACK
Wind Energy Holding Bangkok Open (Bangkok, Thailand): In a rematch of the final in Winnipeg, Canada, two months ago, Blaz Kavcic exacted revenge on Go Soeda. Nearly 8,000 miles away in Bangkok, the Slovenian reached the finish line when Soeda retired down 6-0, 1-0 due to a lower back injury. Kavcic continued his surge up the Emirates ATP Rankings after falling outside the Top 400 following foot surgery at the start of the year. He is projected to rise to inside the Top 250 next Monday. The 29 year old claimed the title, his 14th on the ATP Challenger Tour, without dropping a set.

Aberto do Parana de Tenis (Curitiba, Brazil): Eighth-seed Agustin Velotti needed just 73 minutes to dispatch home hope Andre Ghem 6-0, 6-4 on Sunday, claiming the inaugural title in Curtibia. Velotti continued Argentina’s dominance of the ATP Challenger Tour this year, earning the nation’s 11th title. Argentines are 11-5 in finals, with seven different players lifting trophies. It was Velotti’s first crown in more than three years, having previously won on the clay of Rio de Janeiro in 2013. He is projected to return to the Top 200 of the Emirates ATP Rankings.

Torneo Citta di Como (Como, Italy): Kenny De Schepper notched his fifth ATP Challenger Tour title and first on clay, defeating Marco Cecchinato 2-6, 7-6(0), 7-5 on Sunday in Como. The Frenchman rallied from a set down in both the quarter-finals and final. He is pushing towards a Top 100 return after dropping out of the Top 150 in January.

A LOOK AHEAD
The prestigious AON Open Challenger in Genova, Italy, is back, with Nicolas Almagro, Jerzy Janowicz, Denis Istomin and #NextGen star Elias Ymer key names in the draw. The tournament won co-Tournament of the Year on the ATP Challenger Tour in 2014. Also on the schedule this week are events in South America – Barranquilla, Colombia – and Asia – Shanghai, China. Diego Schwartzman and Jordan Thompson are the respective top seeds. Meanwhile, in Sevilla, Spain, teens Andrey Rublev and Casper Ruud look to go far and Top 100 players Robin Haase and Sergiy Stakhovsky are in action in Alphen, The Netherlands, and Saint-Remy, France.

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ATP CHALLENGER TOUR ON TWITTER: New in 2016, the ATP Challenger Tour has launched a dedicated Twitter account for the latest news and information about players and events. Follow @ATPChallengerTour at twitter.com/ATPChallengerTour.

Juan Martin del Potro’s dream comeback to Flushing Meadows continued on Monday as he advanced to the US Open quarter-finals.

World No. 142 del Potro, who was given a wild card into the main draw, is the lowest-ranked US Open quarter-finalist since the 174th-ranked Jimmy Connors 25 years ago.

The Argentine advanced when Dominic Thiem was forced to retire from their fourth-round clash due to a right leg injury. Del Potro was leading 6-3, 3-2 with a break in the second set.

The 27-year-old del Potro is playing in New York for the first time since 2013. The Tandil native captured his only Grand Slam championship at the US Open in 2009 (d. Federer), but since then his career has been blighted by wrist injuries.

Del Potro played just four matches and underwent two operations on his left wrist in 2015, before making his return to the ATP World Tour in February of this year. In his first tournament back he reached the semi-finals in Delray Beach (l. to Querrey) and last month he clinched the silver medal at the Rio Olympics, playing Andy Murray in the final.

Del Potro is yet to drop a set at the US Open, dispatching Diego Schwartzman, Steve Johnson and David Ferrer. The right-hander is bidding to reach his first major semi-final since Wimbledon 2013 (l. to Djokovic) and goes on to challenge Stan Wawrinka or Illya Marchenko.

Del Potro is set to return to the Top 100 in the Top 65 in the Emirates ATP Rankings after the US Open for the first time since 27 October, 2014.

The 23-year-old Thiem was through to the US Open fourth round for the second time after edging Pablo Carreno Busta on his 23rd birthday on Saturday. The Austrian remains in strong contention to make his debut at the Barclays ATP World Tour Finals later in the year. 

“It was the knee,” said Thiem. “I had some problems with blisters, and maybe because of the compensation the knee started to hurt. I’m going to do an MRI now in the next couple of hours, and then I will have more information about it.

“From the end of the first set, beginning of the second set, it got worse and worse. No other choice.”

For only the second time all tournament long, Novak Djokovic played a full match on Sunday night at the US Open. The top seed showed the rest has only helped.

Djokovic moved into the quarter-finals in New York for the 10^th consecutive year, beating 21 year old Kyle Edmund 6-2, 6-1, 6-4 in Arthur Ashe Stadium. In the last eight, the defending champion will face ninth seed Jo-Wilfried Tsonga for the 22^nd time. The Serbian leads their FedEx ATP Head2Head series 15-6, including 11 of their past 12 meetings. Tsonga advanced to the quarter-finals with a four-set win against American Jack Sock.

“It feels great to play a match,” Djokovic said on court after the contest.

The two-time US Open champion hadn’t played a full match since 29 August, when he beat Pole Jerzy Janowicz 6-3, 5-7, 6-2, 6-1 in the first round. Czech left-hander Jiri Vesely withdrew before their second-round match because of inflammation to his left forearm. Djokovic was leading his third-round match against Mikhail Youzhny 4-2 before the Russian retired because of a back injury.

“This particular situation I [have] never had in my Grand Slam career,” Djokovic, a 14-year tour veteran, had said.

But he looked focused from the start against Edmund, who was playing in the fourth round of a Grand Slam championship for the first time. Djokovic gained two breaks and lost only two points on his first serve in the opener. The second set was more of the same, and after a little more than one hour, Djokovic held a two-set lead against Edmund, No. 84 in the Emirates ATP Rankings.

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But Edmund blasted his forehand more and made Djokovic worry in the third set. The Brit, who was playing in Arthur Ashe Stadium for the first time, fell behind an early break but marched back to lead 3-2 before Djokovic took the final set.

Djokovic’s left wrist, which he said had bothered him last month, looked fine but the 29 year old received treatment on his right arm for the second match of the tournament. Early on in the third set, a trainer massaged Djokovic’s right elbow. A trainer also had treated Djokovic’s right arm during his first-round match.