Novak Djokovic opens defence of his U.S. Open title with a laboured 6-3 5-7 6-2 6-1 win over Poland's Jerzy Janowicz that brings new concerns about the world number one's fitness.

Rafael Nadal and Angelique Kerber shrug off sweltering temperatures to reach the US Open second round as Garbine Muguruza survives a worrying health scare.

Serena Williams' hopes of a fifth Olympic gold medal are crushed by Ukraine's Elina Svitolina as the battle for the women's title in Rio is blown wide open.

Garbine Muguruza's post-French Open slump continued when she crashed out of the Olympics while Andy Murray and Rafael Nadal made the third round

World number one Novak Djokovic is reduced to tears after suffering a shock first round 7-6(4) 7-6(2) loss to Argentina's Juan Martin del Potro in the men's Olympic tennis tournament.

Four-time gold medallist Venus Williams, suffering with a virus, slumps to her first ever opening round loss at an Olympic Games

Tennis world number one Novak Djokovic says he is happy that Russia avoided a blanket Olympic Games ban but admits the scandal was a dark episode for sport.

Andy Murray shrugs off the potential threat of the Zika virus as well as the absence of two of his leading rivals on Tuesday as he prepares to defend his Olympic title.

World number 11 and former Australian Open runner-up Dominika Cibulkova joins the Olympic Games tennis tournament's growing list of absentees.

World number four Stan Wawrinka withdraws from the Rio Olympics with a back injury on Tuesday.

Novak Djokovic, Andy Murray, Rafael Nadal and Serena Williams will display their Grand Slam talents in Rio, but with serious questions being asked over tennis's place in the Olympics after a host of high-profile pull-outs.

Rafael Nadal concedes he is not yet sure that he will be able to represent Spain at the Rio Olympics as his fitness concerns linger.

World number one Novak Djokovic continues his dominance of Kei Nishikori with a 6-3 7-5 victory in the final of the Rogers Cup in Toronto on Sunday.

Frenchman Gael Monfils maintains his run of brilliant form when he nullifies Milos Raonic's big serve to eliminate the local favourite in Toronto.

Top seed Novak Djokovic breezes into the quarter-finals as the Rogers Cup continues pretty much according to script at the Aviva Centre on Thursday.

Roger Federer says he will miss the remainder of the season, including next month's Olympic Games in Rio.

​World number one Novak Djokovic is looking forward to playing on his favoured hardcourt surface at the Rogers Cup in Toronto, but the Serb urged caution as he returns to action for the first time since his shock Wimbledon exit.

Roger Federer and Rafael Nadal on Tuesday pull out of next week's Toronto Masters, joining Wimbledon champion Andy Murray in deciding to skip the event.

Teenager Borna Coric complete an unlikely comeback for Croatia as the small Balkan nation beat the United States 3-2 in a Davis Cup quarter-final in Oregon.

Wimbledon runner-up Milos Raonic and women's world number five Simona Halep deal the Olympics tennis tournament a double blow by pulling out of Rio, citing health fears over the Zika virus.