Jack Sock says he has found a training structure that works for him, with more practice and fitness leading to better performances on tour.
The 22-year-old American, who is ranked No. 60 and got his first Top 10 win against Kei Nishikori in Shanghai, said he is more settled than he was a year ago during his first full season on tour.
"This year I came into it with a little more experience. A few things have built my confidence up. I moved to Tampa and started training with John Isner]. The climate there, the structure there has really helped me in a lot of ways," [Sock told *SI.com*. "Putting everything into tennis, I think the pieces are starting to fall together for me."
Hitting with Isner and sharing a trainer is helping the American move to the next level.
''Practicing with John every day, he's been top 15 for a while now and has had a great career, can only help me. Hopefully I can help him out too. We have great practices," Sock said. "And our trainer is there and he's really helped change my body a lot and I feel like I've got in a lot better shape which has helped me compete with these guys."