Federer up and running in Ohio
Roger Federer made a confident start to his Cincinnati Masters title defence, beating Philipp Kohlschreiber 6-3 7-6 (9/7) in the second round.
The Swiss, a five-time winner in Ohio, created chance after chance on the Kohlschreiber serve on Tuesday night, but one break was enough to take the first set.
The German got an early break in the second but Federer fought back and took the match via a tie-break.
Having missed last week's event in Montreal due to a back problem, it was Federer's first match on a hardcourt since March as he began his preparations for the US Open in earnest.
Afterwards the fifth seed, who could meet old rival Rafael Nadal in the quarter-finals, revealed he had returned to his old racquet having tested a larger one during recent claycourt tournaments in Europe.
He will continue to play with his original Wilson racquet in the US Open but vowed to continue testing the larger version after that.
"I'm going to do more racquet testing when I have, again, some more time after the US Open," he said. "I was playing for a month with the black one, but it's a prototype.
"I feel like I need to simplify everything and just play with what I know best."
Third seed David Ferrer found life considerably tougher against Ryan Harrison.
The American wildcard went toe to toe with his illustrious Spanish opponent but was eventually out-battled 7-6 (7/5) 3-6 6-4.
In the day's other second-round matches Grigor Dimitrov eased past comeback kid Brian Baker 6-3 6-2, while Julien Benneteau overcame Radek Stepanek in three sets.
Two seeds were ousted from the first round as Feliciano Lopez beat Kei Nishikori 6-4 7-6 (7/4) and Gilles Simon was forced to retire with a hip injury when 6-3 1-1 down to Canada's Vasek Pospisil.
There were no such troubles for Milos Raonic, Tommy Haas or Stanislas Wawrinka, who all progressed, while Mikhail Youzhny beat Ernests Gulbis in straight sets to deny the Latvian another shot at Wimbledon champion Andy Murray, who he beat in the Rogers Cup last week. Murray will face Youzhny in Wednesday's first match.
John Isner, Tommy Robredo, Jarkko Nieminen and Nikolay Davydenko were among the day's other winners.