Roger Federer cruised into the semi-finals of the Qatar Open with a 6-1, 6-2 demolition Feliciano Lopez.
Ivan Ljubicic salvaged the opening day of Croatia's Davis Cup semi-final against Russia, winning a pulsating five-set duel with Mikhail Youzhny to level the tie 1-1.
The top seeds eaily beat the Russian pair of Denis Golovanov and Andrei Olhovskiy in a quarter-final match at the Moscow ATP event.
Andy Murray's hopes of a first Grand Slam quarter-final ended in disappointment when he was beaten 6-1, 5-7, 6-3, 6-0 by seventh seed Nikolay Davydenko of Russia.\n\n
The Spanish ace will meet Argentina's Mariano Puerta in Sunday's title round for the French Open men's singles crown.
Sweden's Jonas Bjorkman defeated the world number one 6-3, 6-4 in just over an hour at the Qatar Open.
A round-up of Day 4 at the second Grand Slam of the year.
The tenth seed was beaten by Slovenia's Tina Pisnik in the second round at the French Open.
The Australian Open champion fought off a match-point to beat Vladimir Voltchkov and book his spot in the semi-finals of the San Jose Open.
Indian tennis players enjoyed an all-win day at the US Open as three of them reached the men's doubles third round with their respective partners, while Sania Mirza entered the women's doubles pre-quarters.
It was end of US Open campaign for Somdev Devvarman and Mahesh Bhupathi after they lost their respective hard-fought matches even as Rohan Bopanna had a mixed day.
The winners of the season's first three grand slams Novak Djokovic, Andy Murray and Rafa Nadal put on a masterclass at the Western and Southern Open on Wednesday, strolling into the third round with straight sets wins.