Somdev Devvarman, playing only his second match after returning from a shoulder surgery, put up a spirited fight before losing the first round of the US Open to Ruben Ramirez Hidalgo of Spain, in New York on Tuesday.
World number one Roger Federer got back into his old routine with a 6-3, 6-4 defeat of France's Gael Monfils to reach the Monte Carlo Masters quarter-finals on Thursday.
Federer was two points from an embarrassing exit from the Monte Carlo Masters on Wednesday before rallying to beat Spanish qualifier Ruben Ramirez Hidalgo 6-1, 3-6, 7-6 to reach the third round. The world number one, who failed to retain his Australian Open crown earlier this year, was 5-4 and 30-15 down in the third set before his opponent, ranked 137th by the ATP, crumbled under the pressure.
Top seed David Nalbandian crashed out of the Buenos Aires Open after going down to compatriot Guillermo Canas.