Alexander Zverev is describing himself as "very confident" going into the U.S. Open, having won ATP events in Washington and Montreal leading up to the hard-court major.
The 20-year-old German dropped his opening match in Cincinnati, but attributed the defeat partly to tiredness from his two successful weeks.
"I mean, I just played, what, 12 matches in a two-week span?" he told press in Cincinnati. "I have won one ATP 500 event and one ATP 1000 event. I beat a lot of Top 10 players and have beaten a lot of great players, a lot of tough matches. I'm not a machine. So I'm tired, yeah. There is no hiding it."
Though weary, the youngest player in the Top 10 also played doubles with Leander Paes in Cincinnati.