Marat Safin, just a few weeks short of retirement, knocked out top seed Nikolay Davydenko 4-6, 6-4, 6-2 in a high-profile first-round tie between the two Russians at the Kremlin Cup on Wednesday.
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.
The third seeded Russian will play will play Germany's Tommy Haas for a place in the semi-finals.
Nikolay Davydenko of Russia beat Italy's Andreas Seppi 6-1, 6-2 in the second round of the Hamburg Masters
World No 1 Federer's 36-set record winning streak in Grand Slam tournaments was however snapped by Tommy Robredo in the French Open quarter-finals.
Spaniards David Ferrer and Juan Carlos Ferrero also suffered first round shocks at the Valencia Open on Tuesday.
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.
Russian Nikolay Davydenko beat an exhausted Andy Murray 7-5 6-2 to set up a Masters Cup final against world number three Novak Djokovic on Saturday.
The duo were named Russia's top players by the country's tennis federation at its annual awards gala on Saturday.
The Russian received a warning from the umpire for not trying hard enough during his loss to Croatian qualifier Marin Cilic at the St Petersburg Open.
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.
Russian top seed Nikolay Davydenko will start favourite in the singles while Leander Paes and Mahesh Bhupathi will shoulder local hopes in doubles as the US $450,000 Chennai Open, featuring one of the strongest singles field this year, kicks off in Chennai on Monday. The crowd will see a range of international stars including seven top-50 players competing for the top honour with Swiss Olympic champion Stanislas Wawrinka also throwing his hat in the ring.
Fourth seed Nikolay Davydenko overcame an early fright to beat France's Florent Serra 6-7, 6-4, 6-1 on Tuesday in an error-strewn first-round battle at the Dubai Championships.
Young Indian Davis Cupper Sanam Singh put up a valiant fight against former world number three Nikolay Davydenko before losing in straight sets to the Russian in the opening round of the Malaysian Open.
Swede Robin Soderling built on the momentum that allowed him to beat Rafael Nadal and reached the French Open semi-finals on Tuesday with a 6-1, 6-3, 6-1 drubbing of Russian 10th seed Nikolay Davydenko.
Nikolay Davydenko beat weary Argentine Juan Martin del Potro 6-3, 6-4 to claim the ATP World Tour Finals title at the O2 Arena on Sunday. The wiry Russian, who has climbed to sixth in the world this week, produced a faultless display to claim the biggest title of his career and a $1.5 million cheque.
Mario Ancic's defeat left only two players, American James Blake and German Tommy Haas, in contention for the last remaining slot at the season-ending Masters Cup.
It was fitting that Nikolay Davydenko should get his biggest win of the year on Sunday at a Shanghai Masters tournament dominated by injury retirements and a debate over the length of the season.
World number one Roger Federer overcame a sluggish start before advancing to the Australian Open semi-finals with a 2-6, 6-3, 6-0, 7-5 victory over in-form Russian Nikolay Davydenko on Wednesday.
Juan Martin del Potro survived a tight tussle to squeeze past Swede Robin Soderling 6-7, 6-3, 7-6. He will Nikolay Davydenko, who ended seven years of pain against Roger Federer on Saturday, beating the world number one 6-2, 4-6, 7-5 to reach the final of the ATP World Tour Finals for a second successive year.
Nikolay Davydenko ended seven years of pain against Roger Federer on Saturday, beating the world number one 6-2, 4-6, 7-5 to reach the final of the ATP World Tour Finals for a second successive year.
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.
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.
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.
Serbia's world number three Novak Djokovic crushed Russian Nikolay Davydenko 6-1, 7-5 to win the US $4.45 million Masters Cup in Shanghai on Sunday. Djokovic, the first Serb to win the men's year-ending championship, also earned US $1.24 million to move to within 10 ranking points of world number two Roger Federer.
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.
Dmitry Tursunov will take on Andy Roddick in Friday's first singles of the Russia-US Davis Cup final while Mikhail Youzhny meets James Blake in the second.
The world No 2 survived one of the toughest battles in his long claycourt winning streak to set up a meeting with Fernando Gonzalez.
Russia's Nikolay Davydenko hopes his dazzling displays to win the ATP World Tour Finals title will finally allow him to step out of the shadow of compatriot Marat Safin who retired this month.
Russian world number five Nikolay Davydenko believes he needs to adjust his game and find something extra if he is to challenge the world's top players next season.
World number one Roger Federer recovered from a set down to beat unseeded German Denis Gremelmayr 2-6, 7-5, 6-1 on Saturday to reach his first final of the year at the Estoril Open. He will now face the number two seed Nikolay Davydenko of Russia, who beat France's Florent Serra 6-2, 6-2 in the other semi-final.
Ivan Ljubicic will take on Robin Soederling in Friday's other semi-final.
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.
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.
Flexibility will be the watchword for the Bryan brothers as they prepare for Saturday's doubles match against defending champions Russia in the Davis Cup final. Although the Russians nominated world number four Nikolay Davydenko and Igor Andreev in Thursday's draw ceremony, the Americans believe that doubles pairing could be changed.
Britain's Andy Murray knocked out top-seeded Russian Nikolay Davydenko 7-5 6-2 on Friday to set up a final meeting with Croatian Ivan Ljubicic at the $1 million Qatar Open.
Rafael Nadal beat Nikolay Davydenko 5-7, 6-4, 6-4 to enter the semi-final of the Masters Cup.
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.
Puerta stood in for Spain's Rafael Nadal, who withdrew from the Shanghai event earlier in the day with an ankle injury.