Roger Federer put his recent poor form behind him to beat Adrian Mannarino 6-4 6-2 in his home city of Basel.
Teenage wildcard Karen Khachanov shocked third seed Janko Tipsarevic in straight sets at the Kremlin Cup in Moscow.
Feliciano Lopez came through a tough clash with Jarkko Nieminen to make it through the opening round of the Shanghai Masters.
Andy Murray opened the defence of his US Open title with a masterly 6-2 6-4 6-3 thrashing of France's Michael Llodra.
Order of play for day three of the US Open, with Andy Murray and Serena Williams both in action.
Round-up: Mikhail Youzhny will face Robin Haase in the final at Gstaad.
Roger Federer blamed a back injury after suffering a second embarassing defeat in a week.
Andy Murray won Olympic gold last year but his second round foe at Wimbledon inflicted one of his most chastening defeats.
Round-up: Roger Federer cruised into the second round of Wimbledon following a 6-3 6-2 6-0 win over Victor Hanescu.
There are few players who would welcome the prospect of facing Rafa Nadal, Andy Murray and Novak Djokovic in succession.
Dubbed as Mega Monday, the first day of Wimbledon bursts into life later with Roger Federer and Andy Murray in action.
Andy Murray, Roger Federer, Rafael Nadal and Maria Sharapova all play on Monday as Wimbledon begins with a bang.
ATP World Tour Finals
View : 50448 times
View : 31792 times
View : 31353 times
View : 23165 times
View : 16614 times
Find detailed TV schedules – click here.
Find all the sports news on iPhone, BlackBerry, Android and iPad.
Download the latest Eurosport Australia TV schedules for your favourite sports FREE to your calendar. It's a simple three step process!