Former world number one Lleyton Hewitt was ousted in the first round of the US Men's Clay Court Championship by Martin Alund.
Gael Monfils returned to action with a 7-6 (5) 7-5 win in his first-round encounter with James Blake in Houston.
Australian Open champion Novak Djokovic had to work much harder than expected to book his place in the third round of the Indian Wells Masters.
Simply being back on the tennis court felt like a victory for Mardy Fish on Sunday after the American returned to action following a lengthy recovery from a
Round-up: Novak Djokovic trounced fellow Serb Viktor Troicki 6-1 6-4 in the Dubai Championships first round.
Round-up: David Ferrer moved into the quarter-finals of the Buenos Aires Open with a 2-6 6-4 6-0 win over David Nalbandian.
Round-up: World number 10 Richard Gasquet was dumped out of ATP Marseille in the opening round.
Jo-Wilfried Tsonga got the defence of his Metz title off to a solid start with a regulation 6-3 6-3 win over fellow Frenchman Clement Reix.
Venus Williams will make her Hopman Cup debut in Perth later this year, partnering John Isner to represent the United States.
A struggling Andy Murray edged past Feliciano Lopez 7-6 7-6 4-6 7-6 to advance to the fourth round of the US Open at Flushing Meadows.
Round-up: Roger Federer put on another evening exhibition at the US Open as he brushed aside Germany's Bjorn Phau 6-2 6-3 6-2.
Tennis, like other sports, was bound to have some players using performance-enhancing drugs, American James Blake has said.
Andy Roddick won an all-American clash with James Blake at the Winston-Salem Open, the fifth seed posting a 7-6(6) 7-6(6) victory.
Australian Lleyton Hewitt and American James Blake have been given wildcard spots in this year's US Open at Flushing Meadows.
Round-up: Novak Djokovic came through against Andreas Seppi while Roger Federer eased past Alex Bogomolov at the Cincinnati Masters.
US Open
Tennis
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