Andy Murray, usually so calm and composed on the tennis court, has revealed that he could not bear to watch the Anthony Joshua fight as he knows him personally.
Murray also said how he often shakes while watching the boxing as the nerves get the better of him.
Murray clearly knows how to take the pressure, after winning three Grand Slam titles and being an Olympic gold medalist.
Yet, he said even on TV, the pressure of boxing especially in heavyweight, where one punch can end the fight, makes him extremely nervous.
Murray revealed: “I found it hard to watch the other day. I shake when I watch boxing. My wife was like, ‘Are you OK?’ I had to leave the screen.
“I was unpacking my bag for 30 seconds, then I would come back and watch a little bit.
"I find it really difficult to watch, especially when I know someone that is in the fight.
“With the heavyweights as well – because one punch can change the whole fight – you are kind of on edge the whole time.
"I don’t know what it is exactly. I never used to have that and I don’t get it watching fights where I don’t know the person. But if I’ve met them or feel like I know them a little bit, that’s probably been the case.
“The first time when I couldn’t watch a fight was when David Haye fought Klitschko. I bought the pay-per-view and a few friends came round. I left the room after three rounds and checked my phones for updates to make sure he was fine.
“I watched the fight back after it had finished. But watching it live, I find it hard.”
Murray received the BBC Sports Personality of the Year trophy from a boxer last December Lennox Lewis, and it would be no surprise if he were to pass it on to Joshua in seven months time.
Murray remains third favourite, while female tennis ace Jo Konta is second favourite.
In the meantime, he hopes to start adding to the Dubai title he won in February, which remains his only trophy of the season to date.
The Scot has the French Open on the horizon, which will be followed by the Aegon Championships and then Wimbledon.