Nikolay Davydenko saved two match points as he made a remarkable recovery to beat Rafael Nadal 0-6, 7-6, 6-4 in the Qatar Open final on Saturday.
Venus Williams was beaten by Italy's Flavia Pennetta 6-4, 2-6, 6-4 in the first round at the Kremlin Cup.
Russian Nikolay Davydenko saw off Tommy Haas in the U.S. Open quarter-finals for the second successive year, beating the German 6-3 6-3 6-4 on Wednesday to reach the last four without dropping a set.
Roland Garros runner-up Robin Soderling became the first man to reach the quarter-finals of the US Open on Monday when his eighth-seeded opponent Nikolay Davydenko retired with a leg injury.
Rain played spoilsport at the French Open for the second day running when a torrential downpour stopped the action for a second time on Monday.
Ninth seed Gilles Simon booked his place in the third round of the Cincinnati Masters on Tuesday after a 7-6, 6-7, 6-1 win over Russian Igor Andreev.
Andy Murray overcame a sluggish start before sweeping past Sweden's Thomas Johansson at the $1.5 million Qatar Open.
Second seed Novak Djokovic overpowered seventh-seeded Argentine Juan Martin del Potro 7-5, 6-3 in the opening match of the Masters Cup on Sunday. In the day's second match, fourth-seeded Nikolay Davydenko defeated sixth seed Jo-Wilfried Tsonga 6-7, 6-4, 7-6 after fending off a dramatic comeback by the Frenchman in the third set before a roaring crowd.
Novak Djokovic recovered from a set down to defeat fellow Serb Viktor Troicki 3-6, 6-4, 6-2 in the second round of the Dubai Championships on Wednesday, while India's Somdev Devvarman lost to Cypriot Marcos Baghdatis.
Seedings for the June 23-July 6 Wimbledon men's singles championship were announced on Wednesday.
Top seed Rafael Nadal was stunned 3-6 6-3 6-4 by Italian Andreas Seppi in one of series of second-round upsets at the World Indoor Tournament on Thursday. Second seed Nikolay Davydenko of Russia, third seeded Spaniard David Ferrer and fifth seed Tomas Berdych of the Czech Republic also suffered early exits.
Justine Henin and Maria Sharapova set up an explosive Australian Open quarter-final with crushing wins.
Fifth seed Nikolay Davydenko beat Briton Andy Murray 7-5 6-4 to reach the semi-finals of the Dubai Championships on Thursday.
In other first round matches, at the World Indoor Tournament, second seed Nikolay Davydenko beat qualifier Jan Hernych while David Ferrer advanced with a victory over Italy's Simone Bolelli.
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.
Rafael Nadal will face Nikolay Davydenko in the final of the Shanghai Masters after the Russian sprang an upset on second seed Novak Djokovic with a 4-6, 6-4, 7-6 victory.
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 Chilean produced a dazzling display to reach the semi-finals of a Grand Slam for the first time.
Top seed Roger Federer battled past Russian Nikolay Davydenko in an entertaining 4-6, 6-3, 6-4 triumph on Saturday to reach the World Indoor Tournament final.
World number one Rafael Nadal and fourth seed Andy Murray bagged two wins apiece on Friday to set up a mouth-watering Monte Carlo Masters semi-final. Nadal, gunning for his fifth consecutive title in the principality, swept past Croatian Ivan Ljubicic 6-3 6-3 in his quarter-final while Murray battled past Russian eighth seed Nikolay Davydenko 7-6 6-4.
Roger Federer reached the Monte Carlo Masters final when Serbian Novak Djokovic pulled out of their semi-final.
Roger Federer beat Russian Mikhail Youzhny at the Dubai Open on Saturday.
An inspired Nikolay Davydenko beat top seed and World No 2 Rafa Nadal 7-6 6-3 to become the first Shanghai Masters champion on Sunday.
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 overcame a groin injury to reach her first Kremlin Cup final beating Czech teenager Nicole Vaidisova.
In women's action, comeback queen and former world number one Martina Hingis beat Austria's Sybille Bammer at the Pacific Life Open.
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.
Ivan Ljubicic will take on Robin Soederling in Friday's other semi-final.
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.
List of seeded players for the 2006 Australian Open.
Germany's Tommy Haas beat third seed Nikolay Davydenko 6-3, 2-6, 1-6, 6-1, 7-5 to enter the semi-final.
Unseeded Swiss Stanislas Wawrinka knocked out defending champion Ivan Ljubicic of Croatia 7-6, 6-4 to reach the Qatar Open final.
Croat Ivo Karlovic beat Marat Safin 6-3, 6-4 in the first round of the Madrid Masters.
The Russian lost 6-3, 6-4 to Croatia's Marin Cilic in the second round of the China Open.
Roger Federer staked his claim as one of the favourites for the Australian Open title later this month by romping into the second round of the Qatar Open, while rival Rafa Nadal survived a scare in windswept Doha on Tuesday.
The Argentine ace would have made sure of a berth in the year-end Masters Cup in Shanghai had he not lost to Czech Tomas Berdych.
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.
Nikolay Davydenko proved his victory over Roger Federer last year was no fluke by beating the world number one 6-4, 6-4 on Friday to reach the Qatar Open final. The Russian third seed, who beat the Swiss for the first time in the semi-finals of the ATP World Tour Finals in November, repeated the feat to progress to Saturday's final where he will face world number two Rafael Nadal.
Swiss Federer will be bidding for his fourth consecutive title at Flushing Meadows, while Belgian Henin is hoping to repeat her 2003 triumph.
Jo-Wilfried Tsonga remained on course to defend his Metz Open title with a three-set semi-final victory over Nikolay Davydenko on Saturday but there will no all-French final after Gael Monfils' comeback run was ended by Italy's Andreas Seppi.