Rafael Nadal moved up one place to third, overtaking Britain's Andy Murray, in the men's ATP rankings on Monday thanks to the Spaniard reaching the Miami Masters semi-finals.
Miami champion Andy Roddick of the United States also moved up one place, to seventh, while Murray slipped to fourth.
Czech player Tomas Berdych was the beaten finalist in Miami but thanks to his impressive campaign in Florida he was the biggest mover, up four places to 16th.
Swiss Roger Federer was a fourth-round victim of Berdych's in Miami, but remains well ahead of the bunch.
Murray failed to get past the second round in Miami, losing to American Mardy Fish, which cost him his third place ranking.