Tommy Haas was upset 5-7, 6-4, 6-4 by Russia's Igor Kunitsyn in the opening round of the US Clay Court Championships.
Unheralded Igor Kunitsyn upset former world number one Marat Safin 7-6, 6-7, 6-3 in an all-Russian Kremlin Cup final to clinch his maiden title.
India's Somdev Devvarman entered the second round of the Dubai Duty Free Tennis Championship beating Russia's Igor Kunitsyn in straight sets, in Dubai.
Russia stayed alive in their Davis Cup semi-final against Argentina on Saturday when Igor Kunitsyn and Dmitry Tursunov won the doubles despite a brave fightback by David Nalbandian and Guillermo Canas. Kunitsyn and Tursunov won 6-2, 6-1, 6-7, 3-6, 8-6 after their opponents had saved three successive match points in the third set and gone one break ahead in the fifth.
Rohan Bopanna and Aisam Qureshi rallied from a set down to topple fourth seeded Russian duo of Dmitry Tursunov and Igor Kunitsyn in the first round in Indianapolis.
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.
Israel reached the Davis Cup semi-finals for the first time on Saturday after Andy Ram and Jonathan Erlich gave them an unbeatable 3-0 lead over Russia in their World Group quarter-final.
Continuing to reclaim lost ground in the ATP rankings, Somdev Devvarman jumped 65 places to 250th to be India's best-placed singles player in the list issued on Monday.
Somdev Devvarman's challenge in the Dubai Duty Free Championship ended on Wednesday when he was beaten by fourth seed Juan Martin Del Potro of Argentina in the second round.
India's campaign ended at the $125000 Tashkent ATP Challenger after Davis Cuppers, Yuki Bhambri, Vishnu Vardhan and Sanam Singh got beaten in their respective first round matches.
Fourth seeds Paes and Lukas Dlouhy rallied to a three-set win against Yves Allegro of Switzerland and Fabrice Santoro of France.
Rohan Bopanna and Max Mirnyi beat Mikhail Youzhny and Mischa Zverev 6-3, 6-4 to move into the quarterfinals of the St Petersburg Open.
Rohan Bopanna and his Pakistani partner Aisam-ul-Qureshi stunned fourth seeds Igor Kunitsyn and Dmitry Tursunov in the opening round to advance to the quarter-finals of Indianapolis Tennis Championships. The unseeded Indo-Pakistani pair beat their Russian rivals 2-6, 7-5, 10-6.
Top seed Nikolay Davydenko beat defending champion Juan Monaco to take the Poertschach International title 6-2 2-6 6-2 on Saturday, storming back after an injury troubled him in the second set.
The top seeds beat Igor Kunitsyn and Jeff Thomas 6-3, 6-2 to enter the semi-final of the Memphis Open.
Mahesh Bhupathi and his Bahamian partner Mark Knowles advanced to the Australian Open men's doubles third round after a straight-set victory but it was curtains for Rohan Bopanna and his Finnish partner Jarkko Nieminen who lost their second-round match in Melbourne on Saturday.
Champion Andy Murray and Andy Roddick whacked away the clay from their tennis shoes and began their build up to Wimbledon by beating little-known opponents on a rain-blighted day at Queen's Club on Tuesday.
Spaniard Rafael Nadal claimed to the No 1 position in the ATP Rankings on Monday, replacing his great rival Roger Federer of Switzerland, who had held the top spot for a record 237 consecutive weeks (since February 2, 2004). On the Indian front, Somdev Devvarman continued his ascent in the rankings, breaking into the top-250 after a quarter-final finish at the Legg Mason Tennis Classic.
Seasoned pros Leander Paes and Mahesh Bhupathi showed their class and chemistry by recording a clinical win over Igor Kunitsyn and Teimuraz Gabashvili to keep India's chances alive in the Davis Cup World Group tie against Russia in Moscow on Saturday.
Rohan Bopanna and his Pakistani partner Aisam-ul Haq Qureshi squandered the advantage of winning the first set and went down to the Russian-Czech pair of Igor Kunitsyn and Jaroslav Levinsky in the men's doubles quarter-finals of the Malaysian Open on Wednesday.
Leander Paes kept the Indian challenge alive at the French Open. Partnering Lukas Dlouhy, he advanced to the men's doubles semi-finals on Monday after a thwarting a late challenge from fifth seeds Bruno Soares of Brazil and Kevin Ullyett of Zimbabwe. The Indo-Czech duo won 6-2, 7-6(5) to set up a meeting with either top seeds Daniel Nestor of Canada/Nenad Zimonjic of Serbia or Russians Igor Kunitsyn/Dmitry Tursunov in the semi-finals.
Russia's Dmitry Tursunov was ruled out of the Davis Cup tie against Chile with a wrist injury.
Rohan Bopanna and his Belarussian partner Max Mirnyi overcame a second-set lapse to advance to the semifinals of $ 1,049,000 St Petersburg Open.
Russian Igor Kunitsyn ended the run of Indian qualifier Somdev Devvarman with a 6-4, 6-1 victory in the quarter-finals of the Washington ATP.
Somdev Devvarman continued his fine run to beat Robert Kendrick of the United States 6-2, 6-7(5), 7-5 in the second round of the Legg Mason tennis classic in Wasington on Friday.
The 28-year-old Blake is one of six Americans to make the last eight at the Delray Beach International.
The Indian Davis Cupper wasted three match-points and was beaten by second seed Igor Kunitsyn of Russia 3-6, 7-5, 6-3 at the ONGC ATP Challenger tournament in Delhi.
Germany's Nicolas Kiefer, inching his way back to top form after a long injury layoff, crushed Russian Igor Kunitsyn 6-3 6-2 in the second round of the Los Angeles Classic on Wednesday.
Marat Safin battled to 6-3, 7-6 first round win over Igor Kunitsyn at the Legg Mason Tennis Classic.
The up-and-coming Indian player was beaten by top seed Igor Kunitsyn of Russia in the ATP Challenger in Uzbekistan.
Second seeds Mahesh Bhupathi and Mark Knowles beat the Czech duo of Jaroslav Levinsky and Radek Stepanek 6-2, 6-3 in their opening match at the US $436,000 SAP Open in San Jose, United States.
Marin Cilic began his title defence at the Chennai Open in a comprehensive manner with a 6-2, 6-4 demolition of Igor Kunitysn. The Croat took a little over an hour to tame the out of form Russian.