MEMPHIS, Tenn. (AP) -- Olivier Rochus of Belgium and Philipp Petzschner of Germany pulled off upsets Wednesday during opening-round play in the Regions Morgan Keegan Championships.

Rochus beat No. 5 Alex Bogomolov of Russia, 1-6, 6-4, 7-6 (5) and Petzschner defeated No. 6 Julien Benneteau of France, 7-6 (5), 7-6 (6).

Top seed Andy Roddick plays later Wednesday as does No. 4 seed Milos Raonic, champion of last week's ATP World Tour event in San Jose.

In other men's first-round matches, No. 3 seed Radek Stepanek won 6-3, 6-2 over qualifier Bobby Reynolds, No. 7 seed Kevin Anderson advanced with a 7-5, 6-3 victory over qualifier Robby Ginepri and Jurgen Melzer of Austria beat Denis Istomin of Uzbekistan, 6-7 (2), 6-3, 7-6 (4). Istomin was coming off a runner-up finish in San Jose.

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