It was really good to work things out on court and come through against someone as good as Juan Martin del Potro, after a couple of tournaments worrying about my game and where it was at.
Sometimes it is the case when you play a top player early in a tournament that you're a bit more focused, a bit more alert.
When you're going through the tactics for the match it's maybe a little bit more precise, because you're aware that if you get it wrong, the best players will make you pay for that.