US Open

Greece's Stefanos Tsitsipas hits a return to Tommy Robredo of Spain during the first day of the US Open Tennis Championships at the USTA National Tennis Center in Flushing Meadows, New York, Monday. The 20-year old battled to a 6-3, 7-6, 6-4 victory. [EPA]

Former world number one Serena Williams has yet to make a decision about her participation at the Australian Open, while world number 12 Svetlana Kuznetsova is also a doubt for the first grand slam of 2018 after undergoing wrist surgery.

Maria Sakkari of Greece will face seven-time Grand Slam champion Venus Williams in the third round of the US Open on Saturday after overcoming the resistance of Australian wildcard Arina Rodionova 7-5, 6-3.

With a touch more trouble than anticipated, ninth seed Williams eliminated France's Oceane Dodin 7-5, 6-4 in a second-round match on Arthur Ashe Stadium.

Greece's Maria Sakkari beat 24th-seeded Kiki Bertens of the Netherlands, 6-3, 6-4 in the first round of the United States Open, in New York, on Monday.

Sakkari, No.98, will face Australia's Arina Rodinova, who prevailed over Dutchwoman Richel Hogenkamp, for a place in the third round.

Sakkari, now 22, made her Grand Slam debut at the 2015 US Open.

Grigor Dimitrov proceeded to the second round of the 2015 US Open on Monday, defeating the Australian qualifier Matthew Ebden in three sets.

The 17th seed Bulgarian came through by a comfortable 6-4 6-2 6-4 win over Ebden in New York.

LONDON - Novak Djokovic of Serbia and Serena Williams of the United States were named 2014 World Champions by the International Tennis Federation (ITF) on Thursday.

Novak Djokovic through to semifinals in Beijing

BEIJING -- World number one Novak Djokovic advanced to the semifinals of the ATP tournament in Beijing, after defeating Bulgaria's Grigor Dimitrov Friday morning CET.

Djokovic will next face Britain's Andy Murray, who beat Croatia's Marin Cilic in straight sets 6-1, 6-4, also this morning.

Former world number one Caroline Wozniacki and first-time Grand Slam semifinalist Peng Shuai will meet for a place in the US Open title match after dominant victories on Sept. 2.

Wozniacki, the runner-up at Flushing Meadows in 2009, dismissed 13th-seeded Italian Sara Errani 6-0, 6-1 and is back in the semi-finals of a major for the first time since the 2011 US Open.

Bulgaria's Grigor Dimitrov failed to make it to the US Open quarter-finals after losing to France's Gaël Monfils 5:7, 6:7 (6), 5:7.

Bulgaria's star tennis player, seeded 7th, was defeated by the Frenchman, seeded 20th, in a match of 2 hours and 24 minutes, according to reports of the BBC News.

Dimitrov failed to avenge a first round US Open defeat to Monfils in 2011.

NEW YORK - World number one Novak Djokovic defeated France's Paul-Henri Mathieu 6-1 6-3 6-0 in the 2nd round of the US Open on Thursday.

Djokovic had an easy job against Mathieu and showed strength in this year's bid for his second US Open title. He won the first in 2011.

His next opponent will be Sam Querrey of the US , who ousted Spaniard Guillermo Garcia-Lopez 6-3 6-4 6-4.