Alexander Zverev says he has shown physical and mental improvement this season, allowing him to compete with the top players even in long, tight matches.
Zverev has defeated Roger Federer and Novak Djokovic this season and took Rafael Nadal to five sets at the Australian Open, in addition to winning five titles.
"I think physically I'm a lot stronger. I have showed that over a lot of matches. I am able to last against the best guys. Not only last but, you know, play at the highest level," he said. "Also mentally, you know, I'm able to finish matches, able to compete with the best."
The 20-year-old German says the stats show he's also playing the big points better.
"But I think all around, you know, if you look at the stats from [in 2016], my second-serve points won percentage, which I think is a very important one in tennis, was very low. This year I'm one of the best on tour," he said. "You know, everything from first-serve percentage to breakpoints won and stuff like this, I think all those stats show that I have worked on different things in the offseason."
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