Best men's match: Roger Federer-Novak Djokovic, U.S. open.

年度最佳男子比赛——费德勒vs德约科维奇，美国网球公开赛。

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Federer wound up with 66 unforced errors, 28 more than Djokovic.

费德勒有66次非受迫性失误，比德约科维奇多28次。

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"I knew I had to play my best tennis to have a chance against Djokovic," Isner said.

“我知道我必须发挥出自己最好的水平，才能有战胜德约科维奇的机会，”伊斯内尔说。

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He beat (Novak) Djokovic before in Miami so I wasn't expecting it to be easy.

CNN: Nadal and Murray ease into second round

For Djokovic, there has been no shortage of pick-me-ups in the past nine months.

WSJ: Novak Djokovic's Gluten-Free Ascendancy

Djokovic's serve, sloppy as recently as last season, is now precise, fluid and, at times, devastating.

WSJ: Novak Djokovic's Gluten-Free Ascendancy