the world no 1 , who is bidding to win his third masters title in a row , lost the first two games of the match before battling back to set up a final against sixth seed tomas berdych .
the second set hinged on an 11-minute game at 3-3 , with nadal surrendering a 40-0 lead to suffer what proved to be the vital break .
nadal will , however , take the positives out of his run to the semi-finals as he struggles to rediscover .