Santiago Giraldo

Bulgaria's top male tennis player Grigor Dimitrov proceeded to the second round of the men's singles competition at the Mutua Madrid Open.

Dimitrov defeated on Tuesday Donald Young from the USA with 6:4, 3:0 after retirement of the US player in the second set due to an injury.

World number two Roger Federer has eased past fellow 33-year old, the Finn Jarkko Nieminen, with a dominant display to reach the quarterfinals of the TEB BNP Paribas Istanbul Open.

Federer, showing flashes of brilliance mixed with occasional errors, closed out in just over an hour to win the second round match 6-2, 7-5.

HOUSTON - Serbia's Janko Tipsarevic failed to reach the quarterfinals of the ATP tournament in Houston, after losing to Colombia's Santiago Giraldo in the second round in straight sets 7-6 (7-2), 6-3 early Friday morning CET.

It took Giraldo, currently 32nd in the world rankings, an hour and a half of play to reduce Tipsarevic's head-to-head advantage to 2-1.

HOUSTON - Serbian tennis player Janko Tipsarevic had a successful start at the Houston Open, scoring a hard-fought win over Guilherme Clezar of Brazil 6-4, 3-6, 7-6 (9-7) late on Tuesday CET.

SHENZHEN - Serbia's Viktor Troicki has failed to reach the semi-finals of the Shenzhen ATP tournament after losing to Santiago Giraldo of Colombia 7-6 (8-6), 6-3 on Friday.

It was Troicki's second career defeat to Giraldo, who previously beat him in Hertogenbosch in 2010.

NEW YORK - Serbian tennis player Nenad Zimonjic and Canada's Daniel Nestor qualified for the U.S. Open third round in men's doubles as they defeated Columbia's Nicolas Barrientos and Santiago Giraldo in the second round match late on Friday (CET), 6-2, 6-2.

CINCINNATI - Serbia's Nenad Zimonjic and Daniel Nestor of Canada reached the men's doubles quarter-finals at the Cincinnati ATP Masters 1000 tournament early Thursday by beating the Spanish-Colombian pair of Guillermo Garcia-Lopez and Santiago Giraldo 6-3, 6-2 in just 44 minutes.