Federer after producing second consecutive comeback against Dzumhur: 'It's just a bit frustrating more than anything'

He also lost the first set to Sumit Nagal before storming back to ease through and for Federer it's frustrating but he admits it lies with the level of his opponents that mean his energy isn't there.

The Swiss ace said though that he is not concerned as he gets better every time he loses the first set. He added that he can't reinvent himself before the third round so will just keep the same preparation when he faces Lucas Pouille or Dan Evans.

"I have been in that position many times where you go through a little phase where you don't start so well... When it happens like this back-to-back matches, it's just a bit frustrating more than anything, especially when the level is that low and there is that many errors and the energy is not kind of there," said Federer.

"But I'm not concerned. It's all good and I just need to take the positives out of it, because once I lose that first set I do get better, which is a good thing."

"I can't reinvent myself from today to the third round," he added. "Tomorrow I will not practice over an hour, because I believe that all the hard work I have put in since Wimbledon and before, that I'm ready for that."