Andy Murray says he will have to serve much better than he did in winning the Miami Masters if he wants to be a serious contender in the clay court season.
Murray won a titanic duel with David Ferrer in the Miami final, fighting back from match point down to win 2-6 6-4 7-6 (7-1).
The victory means he climbs above Roger Federer and becomes the world No 2 for the first time. And for the first time since 2003, neither Federer or Rafa Nadal are in the top two.
But the tour now moves on to clay where Murray - who prefers fast surfaces - has never had much success.
He admits his first serve percentage against Ferrer, just 54 per cent, is something he will have to improve.
"I served poorly. If I'd served better I could have made it easier and that's something I need to do better in the clay court season," he told Sky Sports 1.
"This week I did a lot of things well but I need to serve better. If I serve better I'll be able to win matches like today more comfortably. It's easier to return on clay so it's even more important to serve well."