Zverev has a 62-8 win-loss record against opponents ranked 11 and below in the world this year, but he has only won three of 12 matches against top-10 players. The German, 29, claimed he is the only tennis player who has to explain why it is acceptable for him to sit at the top of the rankings.
Zverev did not specify which issues had been annoying him after going to the top of the rankings.
He has always firmly maintained his innocence and has insisted the allegations are baseless.
Looking at his performance on Wednesday, Zverev said:"To simplify it, he played really good and I played really bad.". I don't think anybody had to explain themselves as much as I had to do in the last couple of days, which for me, is annoying, to be honest,"Zverev said. Alexander Zverev said he has been annoyed by the reaction to him becoming world number one after a loss on Wednesday.