Jack Sock says he wants to reduce his doubles schedule, and will stop playing regularly with Vasek Pospisil.

The Canadian-American pair won doubles titles at Wimbledon (2014) and in Indian Wells (in 2015), and this season reached two Masters finals. However, Sock said that while the two would still attempt to play together “when we can," he told his partner after Wimbledon that he would be playing less.

"I don't see myself, maybe, playing any more Grand Slam doubles," said Sock. "That was a talk I had with him … But doubles, for me, is going to be a lot more low-key now. There's going to be a lot less tournaments."

Both Sock and Pospisil played doubles in Toronto, but as previously arranged, they partnered with different players. Sock paired with Nick Kyrgios, while Pospisil played with fellow Canadian Daniel Nestor.

Sock, who is ranked No. 26 in singles and No. 24 in doubles, pointed to the lack of top players who play doubles at the majors.

"I want to put all my energy in the singles," he said.

Pospisil is No. 22 in doubles.