Roger Federer continues his Cincinnati Masters title defence against Philipp Kohlschreiber.

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Federer had a very easy start to the tournament, cruising to a 5-2 lead against Denis Istomin before the Uzbek retired with an ankle injury.

Federer and Kohlschreiber will be no strangers to each other's games having practised before the tournament and Federer has plenty of respect for the German.

"It's gonna be a tricky match because of what we went through the last couple of weeks," he said. "I'm happy he's playing well. He's a good guy. He's dangerous. He's got the shots. He's beaten great players along the way. Roddick at the Australian and Djokovic at the French, and has played a few close matches against me in the past. We'll see how it goes."

Kohlschreiber looked very dangerous in Toronto, he reached the quarters and came close to a shock upset against Rafael Nadal, taking the first set against the top seed before falling in three. He has however looked less impressive in Toronto, defeating Horacio Zeballos 6-7, 6-3, 6-4 and Alejandro Falla 6-0, 1-6, 6-3.   

Federer has won all five of his past matches with Kohlschreiber, dropping just the one set in the process (at Wimbledon 2009). When they met on the grass of Halle in June, Federer ran out a 7-5, 6-3 winner.

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