Roddick lost four games in a row to Mario Ancic when their rain-delayed semi-final resumed on court one this afternoon, the unseeded Croatian taking the set 6-4 to level the match.

But the second seed then turned the tables and emerged from another rain break at 4-5 down in the third set firing on all cylinders, storming through the next three games to take the set 7-5 for a two sets to one lead.

The fourth set went with serve until Ancic crumbled under the pressure in the 11th game.

A double fault gave Roddick two break points and although Ancic produced a brilliant second serve to save the first, another double fault gifted his opponent the break and a chance to serve for the match.

Roddick had the advantage of serving with new balls but needed to save a break point before finally completing a 6-4 4-6 7-5 7-5 victory to seal his place in the final against Roger Federer.