It's always difficult, especially the U.S. Open, the last of the Grand Slams. It's always tough because you know, the season is very long. I really played a lot this year. Sometimes it's really hard to stay focused all the time because you're really tired after the whole season.
这总是很困难的,尤其是美网,最后一个大满贯。这总是很艰难,因为你知道,赛季很长。今年我打了很多比赛。有时候很难一直保持注意力集中,因为你整个赛季都很累。
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