Fitness makes the difference for Murray
Isn't it amazing, the journey Andy Murray has travelled from 2005? Back then he was the stick insect of the tour, an 18-year-old who broke down at Queen's, then Wimbledon, and struggled to go the distance at the US Open a few months later.
Here we are now, five years later, and he's without question one of the fittest guys on the tour.
Monday's 4-6 6-7 (5-7) 6-4 6-2 6-1 victory over Richard Gasquet in the first round of the French Open was the Scot's seventh in his last eight best-of-five matches, and that's an incredible record.
It's the reason he goes in the gym, runs up and down South Beach in Miami, and it's why he got back into full training in the last month or so after giving it a little bit of a miss in February.
On Monday morning around Roland Garros the subject of discussion was how long could Gasquet last? The general consensus was he could probably offer two good sets and it would be downhill from then on - it was just going to be a question of how long those first two sets were going to be.
And as the match progressed it was a really strange feeling while we were commentating on 5 live because, even at two sets down, you still fancied Murray.
We knew that in Nice on Saturday Gasquet had played this long match with Verdasco and received treatment on his left leg, just above the knee, and that must have felt stiff when he woke up on Sunday morning. Then he comes to Paris and 48 hours later he's got to play Murray.
The British number one just had to keep believing and keep in his mind that Gasquet was going to hit the wall at some point. We knew it, Gasquet probably knew it, the fans probably knew it, and in the end that's exactly what happened.
Having said that, it certainly wasn't Murray's strategy to go two sets down, but how well was Gasquet playing? The outright winners he was hitting were ridiculous, and yet Murray wasn't far away. He wasn't playing spectacular tennis but he was sticking with his man and mentally he was very strong.
The crucial moment came in the sixth game of the third set when Gasquet led by two sets and a break. He slipped to 0-40 and the wayward forehand he then hit was the turning point - it almost hit the fence, and that summed up the destination of the match.
Gasquet's head sank immediately and I think Murray knew that would be the equivalent of the running backhand winner at Wimbledon two years ago, when he ended up in the photographer's pit.
Murray, I thought, played very sensibly after that. He got many more first serves in, kept his head and used his court sense to move Gasquet around. Even though there were one or two moments when it got a little tricky, he came through in the end.
And maybe for an omen you could look at Tim Henman in 2004, when the Englishman went two sets to love down before beating Cyril Saulnier in the first round and going on to reach the semi-finals.