Jack Sock

For the first time since October 2012, Grand Slam winning record holder Roger Federer has again climbed to the top of the world tennis rankings. At 36, the Swiss replaced Rafael Nadal (Spain) and officially became the oldest number one in history. The previous record holder was Andre Agassi (USA), who headed the ATP rankings at 33 in 2003.

Grigor Dimitrov is No. 3 in the world rankings. The Bulgarians failed to defend his title from Brisbane and lost 160 points from his assets.

With 4990, the Bulgarian led with 380 points the fourth Alexander Zverev, who had not yet participated in an official tournament in 2018, and in the first week of the new year he was in Perth for Hopman Cup.

Bulgarian tennis player Grigor Dimitrov has ended his participation in the Indian Wells ATP tournament. Dimitrov, seeded 12th, lost 6:3, 3:6, 6:7 to American Jack Sock.

Grigor Dimitrov, the highest-ranking tennis player of Bulgaria, has retained his 18th place in the ATP ranking, the association's website shows.

Dimitrov, who lost to the world's then No 131 Vasek Pospisil last week after an unprecedented victory over Richard Gasquet, is now to take part in the Stockholm tournament.

Bulgarian top male tennis player Grigor Dimitrov defeated on Sunday Lukas Rosol (Czech Republic) at the Western and Southern Open tennis tournament in Cincinnati, Ohio.

The game of three sets, which lasted 1 hour and 25 minutes, ended 6:2, 3:6, 6:3.

Dimitrov will have to face in his next match either Vasek Pospisil (Canada) or Denis Kudla (US).

Bulgaria's top male tennis player Grigor Dimitrov is facing Argentina's Guido Pella later on Wednesday in the second round of Citi Open in Washington DC.

This is the first-ever game between Dimitrov and Pella. For the Bulgarian, it comes at a time when he is trying to recover after a tough season of defeats.

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.

INDIAN WELLS - Serbian tennis player Nenad Zimonjic and Poland's Marcin Matkowski failed to qualify for the Masters 1000 in Indian Wells as they were defeated by Canada's Vasek Pospisil and Jack Sock of the U.S. in the match early on Saturday (CET), 6-4, 3-6, 10-6.