Lleyton Hewitt was dumped out of the Cincinnati Masters in straight sets by Serbia's Viktor Troicki on Thursday morning (AEST).
Hewitt, who beat Mikhail Youzhny in the first round after being handed a wild card, lost 6-2, 6-0 to the world number 32 who will now play Juan Del Potro in the third round.
The 2001 champion has been granted a wildcard for the US Open and will be desperate to find some form before the event at Flushing Meadows begins on August 27.
Bernard Tomic will meet Roger Federer in the third round after the world number one defeated Russia's Alex Bogomolov in straight sets, 6-3, 6-2.
The Swiss maestro, who won in Cincinnati in 2005, 2007, 2009 and 2010, needed just an hour to seal victory.
"It was a good match for me," said the 17-time grand slam champion. "It was a good win. I don't know his game that well, but we played a good match. The switch from grass to hardcourt is difficult.
"This court is faster than Wimbledon and the bounce is really high. It was a good first round for me. It may have gone quickly and there were hardly any rallies, but I was pleased to close it out."
Second seed Novak Djokovic made a scratchy start while Andy Murray motored through as the pair of seeds won opening matches after byes.
Djokovic did not even have the chance to hit on the showcase court after arriving in the midwest US from his post-Olympic title in Toronto at the weekend. But the Serb toughed out a defeat of Italian Andreas Seppi 7-6 (7-4), 6-2.
Djokovic will line up in the third round against Russian veteran Nikolay Davydenko, who beat Florian Mayer of Germany 6-3, 6-3.
Murray, the Olympic gold medallist who played one match last week in Toronto and then quit with a sore knee, showed no sign of injury as he efficiently handled American Sam Querrey 6-2, 6-4, taking just 83 minutes to get his game into shape.
"It felt fine," he said of his knee. "I moved well today. It was still giving me a little bit of trouble in practic for a couple of days before the tournament, but it felt much, much better on the court today.
"I'm hoping it won't be a problem."
Federer's fellow Swiss Stanislas Wawrinka upset fourth seed David Ferrer 6-4, 6-1.
Argentine sixth seed del Potro knocked out Germany's Tommy Haas 7-5, 6-2, but Czech Radek Stepanek returned the favour with his defeat of Argentina's eighth seed Juan Monaco 7-6 (7/2), 6-1.
Mardy Fish, the US tenth seed, beat Argentine Carlos Berlocq 6-3, 6-1 and Croatian 12th seed Marin Cilic put out Jesse Levine 7-5, 7-6 (8/6).
In the women's second round, top seed Agnieszka Radwanska dispatched Swede Sofia Arvidsson 6-4, 6-3.
Fourth seed Petra Kvitova defeated German Mona Barthel 3-6, 6-2, 7-5 while number six Caroline Wozniacki hammered Sesil Karatantcheva 6-1, 6-0.
Italy's seventh seed and Roland Garros finalist Sara Errani beat Slovak Daniela Hantuchova 6-4, 6-4.
Errani will now meet Venus Williams who recovered from an early deficit to beat South Africa's Chanelle Scheepers 2-6, 6-3, 6-2.
ABC/AFPTags: sport, tennis, united-states First posted August 16, 2012 07:57:55