Jack Sock: 'I've always believed I can play at this level'

Jack Sock: 'I've always believed I can play at this level'

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Jack Sock wasn't kind to himself after his defeat to Grigor Dimitrov in the semi-finals of the World Tour Finals on Saturday. 'Not too close when you win three games in two sets,' Sock admitted. But, he was appreciative of Dimitrov's performance. 'I mean, had a pretty poor start to each set.

Got down a break in the first. Was able to get it back. Didn't win a game in the second. Had some looks early in the third. When you play a guy, a player of that caliber, you can't give him that many opportunities, that many free points.

He took advantage today. I thought he really stepped up his level in the second and third [sets]. Yeah, he stepped up his level for sure. There's a reason he's been playing this consistently all year. That's the reason he's in the final.' But, looking at the bigger picture of how the year has been for him, Sock said, 'I can't complain.

Shouldn't have been here in the first place. Yeah, I mean, to be here, my first appearance here, to make the semis, getting through a pretty tough group I thought, beating some good players. Obviously both groups are very tough.

For my first time, to play the three guys that were in our group, to get through, was a big confidence booster for me. Definitely going to take the experience from the last three weeks, everything I learned, all the things I did well in the matches, things I can improve, work on those in the off-season, and get ready for 2018. I've always believed I can play at this level, play there consistently.

Now to do it over a couple weeks, I would say is more reassurance going into next year than learning things.' Asked if he would still continue to play doubles, the 2014 Wimbledon men's doubles champion replied: 'I was never a doubles specialist, even though you guys think that for some reason.

I feel like I'm a decent singles player. I've always been. Yeah, I had some good results in doubles. I mean, I play for fun with some friends when I want to. But as you can see from the second part of last year and this year, I kind of just pick and choose the times.

I've heard that a lot, but you're fine.' ALSO READ: Dimitrov says Rafa Nadal told him to 'forget' about loss at Australian Open .