World No 7 Fernando Gonzalez stayed on course for his first title of the year a quarter-final victory over South Korea's Lee Hyung-taik at the China Open.
The Russian lost 6-3, 6-4 to Croatia's Marin Cilic in the second round of the China Open.
top seed Tommy Robredo lost his opening match at the Swedish Open on Monday to Peruvian Luis Horna.
Roger Federer reached a record eighth consecutive Grand Slam final by overcoming Nikolay Davydenko 7-5, 7-6, 7-6.
The unseeded Russian beat Marcos Baghdatis to reach the quarter-finals of a Grand Slam for the first time at the French Open.
The Argentine concluded an ideal warm-up for the French Open with a 7-6, 6-0 win over the Frenchman in the Poertschach International final.
Roger Federer beat Russian Mikhail Youzhny at the Dubai Open on Saturday.
The world number two, whose victory took his winning streak on clay to 75 matches, went through to a semi-final against fourth seed Nikolay Davydenko at the Rome Masters.
The Spaniard acknowledged he will have his work cut out to beat the world number one in Saturday's Masters Cup semi-final.
Russia's Marat Safin knocked out Swede Robin Soderling in a second-round match at the Paris Masters.
The Russian overcame a groin injury to reach her first Kremlin Cup final beating Czech teenager Nicole Vaidisova.
Ivan Ljubicic and Nikolay Davydenko advanced to the quarterfinals of the China Open.
World number one Roger Federer had to play three sets to reach the Qatar Open semi-finals on Thursday, while number two Rafael Nadal had an easier ride when his opponent retired injured to put him in the last four. Swiss Federer survived a scare from 21-year-old Latvian Ernests Gulbis before winning 6-2, 4-6, 6-4 to progress to the next round where he will face Russian third seed Nikolay Davydenko who beat big-serving Croat Ivo Karlovic 7-6, 7-6.
The 19-year-old will equal Guillermo Vilas's 1977 record of 53 consecutive wins on clay if he retains the Rome Masters title this week.
Holders Croatia had to be content with a win and a loss from the opening day's two singles rubbers in the Davis Cup.
The top seeds eaily beat the Russian pair of Denis Golovanov and Andrei Olhovskiy in a quarter-final match at the Moscow ATP event.
In women's action, comeback queen and former world number one Martina Hingis beat Austria's Sybille Bammer at the Pacific Life Open.
Andre Agassi slumped to a 7-5, 7-5 defeat against Bjorn Phau at the Dubai Open
Roger Federer produced an imperious display to dismiss unseeded German Florian Mayer 6-1, 6-4, 6-0 in the second round
The top seed beat Mariano Puerta in 72 minutes to set up a semi-final with France's Paul-Henri Mathieu in the Montreal Masters.
The Spaniard beat Tomas Zib 6-2, 6-1 to register his 32nd successive win on clay.
The World number one won his 20th consecutive match on Friday as he breezed past Russian Nikolay Davydenko 6-3, 6-4.
Roger Federer cruised into the semi-finals of the Qatar Open with a 6-1, 6-2 demolition Feliciano Lopez.
Argentina beat Russia 3-2 while Spain ended the reign of defending champions United States, winning the other semi-final 4-1.
Juan Martin del Potro demolished Igor Andreev in straight sets on Sunday to give Argentina a 3-2 win over Russia and send them into a Davis Cup final against Spain.
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.
The world number one battled back from a break down in the final set to fend off the Aussie and reach the final of the Cincinnati Masters.
Germany's Tommy Haas beat third seed Nikolay Davydenko 6-3, 2-6, 1-6, 6-1, 7-5 to enter the semi-final.
The Argentine No 1 overpowered Russia's Marat Safin in the second singles after Nikolay Davydenko beat Juan Ignacio Chela.