Four-time Rogers Cup singles champion Novak Djokovic was upset by #NextGenATP Greek Stefanos Tsitsipas on Thursday. But the Serbian got right back out on the court with his recent Wimbledon final opponent, Kevin Anderson, and beat defending champions Pierre-Hugues Herbert and Nicolas Mahut 4-6, 6-4, 10-7 to advance to the doubles quarter-finals in Toronto.

“It was definitely great to finish off the day, with a win in doubles after the disappointing match for me today,” Djokovic said.

From 8/2 up in the Match Tie-break, Anderson and Djokovic lost six of the next seven points against the Frenchmen. But the Serbian finished off the match with a forehand winner from the forecourt.

The first-time pairing will look to continue their strong run at the ATP World Tour Masters 1000 event against first-year duo Nikola Mektic and Alexander Peya, who upset sixth seeds Jamie Murray and Bruno Soares 6-4, 6-4 in 77 minutes.

Mektic and Peya claimed their first team title at this level at the Mutua Madrid Open. They also triumphed earlier in the year in Marrakech, helping them to their current standing of fourth in the ATP Race To London.

There were two other upsets on the day, as Raven Klaasen and Michael Venus beat fifth seeds Lukasz Kubot and Marcelo Melo 6-3, 5-7, 11-9. Americans Sam Querrey and Rajeev Ram also defeated eighth seeds Juan Sebastian Cabal and Robert Farah 7-5, 4-6, 10-8.

Reigning Wimbledon champions Mike Bryan and Jack Sock led the rest of the day’s winners, along with second seeds Henri Kontinen/John Peers and seventh seeds Jean-Julien Rojer/Horia Tecau.

Daniel Nestor drew a line under his Rogers Cup career on Wednesday night, but the 45-year-old remains hopeful that wild cards may briefly extend his ATP World Tour farewell.

The 45-year-old, who plans to retire from professional tennis in September, was competing at the ATP World Tour Masters 1000 tournament for the 30th straight year and fought hard with fellow Canadian Vasek Pospisil in Toronto. Spaniards Feliciano Lopez and Marc Lopez triumphed 6-7(6), 6-2, 10-6 over one hour and 36 minutes.

Nestor and Pospisil saved one set point at 5/6 in the first set tie-break, but lost the first four games of the second set. They battled back from a 1/5 deficit to 6/7 in the Match tie-break, but couldn’t deny the Spaniards, who next play fourth seeds Mike Bryan and Jack Sock in the second round.

“I was planning on playing the next two [Western & Southern Open and the US Open],” admitted Nestor. “It depends on wild cards and all that. It’s out of my control, but I would like to play Davis Cup as my last match… That was the plan all along.”

Elsewhere, Grigor Dimitrov and David Goffin, who both contested the championship match at last year’s Nitto ATP Finals, knocked out all-French duo Jeremy Chardy and Lucas Pouille 7-6(5), 6-4 for a second-round meeting against top seeds Oliver Marach and Mate Pavic.

Pablo Carreno Busta and Joao Sousa will face second seeds Henri Kontinen and John Peers after coming through a 4-6, 6-2, 10-4 victory over Edouard Roger-Vasselin and Fernando Verdasco in 77 minutes.

Ben McLachlan and Matwe Middelkoop struck seven aces to edge past Borna Coric and Robin Haase 5-7, 6-3, 10-7 in 75 minutes. They will now prepare to meet seventh seeds Jean-Julien Rojer and Horia Tecau in the second round.