It's not choking when the other guy has more aces, less double faults, a better first serve percentage, better win rate on first serve, better win rate on second serve, better win rate on first serve return, better win rate on second serve return, more winners, less errors, better break point conversion, and more successful net approaches. You're just a worse player.
I sense bitterness from the haters. ¯\_(ツ
_/¯
I mean, he won't beat Djokovic, but he was just better than Berdych, there's not much more to it.