Andy Murray played against Radek Stepanek like it was a junior Wimbledon match against a player from Ecuador instead of the number 14 seed.
And that's his secret - he's so cool and relaxed inside, so poised that nothing seems to faze or affect him.
It was his first time on Court One and by the third set he was controlling the place and the atmosphere.
He was getting tired in the third set and shook his arms around, as if to say 'Let's get this party started again'.
His mental approach is the reason why he's still in the tournament.
He's not supposed to be there - he's ranked 317 in the world, he'd played four official matches on the ATP Tour at the start of Wimbledon.
So now he's up to six matches - most players play that in two weeks yet he's come in with the calmness of a seasoned veteran. I think that's the secret of his success.
It was a really gutsy performance - there was so much heart and soul out there.
Even when he was serving for the match when you're bound to be really nervous, he stuck to his game plan. He wasn't fazed by the occasion.
Now he should stick to his routine and do exactly what he's been doing all week long.
He should have dinner with his mother and then on Friday he should talk to (coach) Mark Petchey about his game plan, which was excellent against Radek Stepanek.
He should eat the same food, drink the same water, whatever, stick to his routine!
Boris Becker was talking to Sue Barker on BBC1.