Briton Andy Murray will take over from Novak Djokovic as World No 1 when the rankings are updated on Monday after his Paris Masters semi-final opponent Milos Raonic withdrew with a leg injury on Saturday.
Tournament favourite Novak Djokovic beat Finnish veteran Jarkko Nieminen 6-2, 7-5, 6-2 on Tuesday, kicking off his quest for a first ever Paris trophy to add to his eight other Grand Slams.
PHOTOS from day four of the Wimbledon championships at the All England Lawn Tennis and Croquet Club in London on Friday.
Defending champion Angelique Kerber battled her nerves and blew a match point in the second set before finally overcoming Lesia Tsurenko 6-2, 5-7, 6-2 to reach the second round.
The triple grand slam winner, who will take over from Serb Novak Djokovic at the top when the rankings are updated on Monday, still went out on centre court for a practice session in front of a bemused crowd.
Images from Monday's action at the French Open.
US Open champion Martin Kaymer sank an eight-foot birdie putt at the first extra hole to beat Bubba Watson in the four-man PGA Grand Slam of Golf in Bermuda on Wednesday.
For all their celebrated Grand Slam past, Nadal and Federer have never clashed in a US Open final.
Coming into the do-or-die match, Rohan Bopanna and Leander Paes, with a combined age of 86, won 6-3, 6-7(9), 7-5 after two hours and 21 minutes against Pavic and Skugor, ranked 15 and 32 respectively.
The top-seeded Serb, who had not dropped a set in four matches since the round of 16 at the Australian Open in January, looked out-of-sorts throughout the 98-minute contest.
Fifth seed Maria Sharapova averted an early exit on a sweltering day in Flushing Meadows. Updates from Wednesday's play.
A rampant Rafael Nadal turned on the style to beat old rival Novak Djokovic 7-6(4), 6-3 on Saturday and reach his first Italian Open final since 2014. The top-seeded Spaniard will face defending champion Alexander Zverev who overcame fourth seed Marin Cilic of Croatia 7-6(13), 7-5 in the other semi-final.
Andy Murray clinched the Vienna Open title on Sunday with a 5-7, 6-2, 7-5 victory over David Ferrer, one of the Briton's main rivals in the battle to qualify for the ATP World Tour Finals.
Photos from the US Open matches played on Monday
IMAGES from the matches played at the PNB Paribas Open at Indian Wells on Sunday
A summary of Tuesday's action at the US Open.
The 32-year-old, five-times a winner of the singles at the prestigious Wimbledon warm-up event, delighted a large evening centre court crowd with some fluent shot-making as he and Spanish veteran Lopez beat top seeds Juan Sebastian Cabal and Robert Farah 7-6(5), 6-3.
India's Leander Paes and Rohan Bopanna crashed out of the Japan Open following a straight set defeat against Ivan Dodig and Marcelo Melo, in Tokyo on Thursday.