Roger Federer was praised by his former coach Paul Annacone for being one of "the best" at not stressing about things outside of his control.

The 20-time Grand Slam champion worked with the American coach from 2010 to 2013. During this time, Annacone helped him to achieve victory at the 2012 Wimbledon championships and two consecutive ATP Finals in 2010 and 2011.

The 60-year-old has also had experience training several other big names in the sport over the years, most notably Pete Sampras, whose record of 14 Grand Slam titles was broken by Federer in 2009 before Rafael Nadal and Novak Djokovic surpassed the Swiss former player in 2022. Annacone has also worked with Stan Wawrinka, Sloane Stephens, and Tim Henman. He is currently coaching World No. 8 Taylor Fritz.

In a recent episode of the "Baseline Intelligence with Jonathan Stokke" podcast, Annacone revealed that he has never seen Federer give in to pressure or lose his composure about things that were beyond his control.

"One of the things I’ve learned about Roger is, how important it is to be able to let go of things you can’t control and how important it is to be able to really stay in the moment and to be content with trying to execute your game plan even if it’s not successful.

"What I mean by that is he’s one of the best people that I’ve ever seen at not sweating the small stuff and not sweating things that he can’t control," he said.

Annacone has also praised Federer's friendly nature in the past, saying that he could spend all day with the now 42-year-old.

"Roger's one of these guys that you could spend all day with. I mean, what you see is what you get," he said. "He loves people, he loves life, he is a citizen of the world - one of the most optimistic people I have been around," he explained.