Cincinnati Masters: Federer opens with win over Gojowczyk, Serena  ousted

The 20-time Grand Slam champion, who turned 37 last week, is pacing his tennis year, playing a limited schedule and missing events when he feels the need to rest.

Roger Federer, of Switzerland, returns to Peter Gojowcyzk, of Germany, at the Western & Southern Open tennis tournament. (Photo | AP)