Nadal, Serena win first-round matches (AP)

[ASFN Admin]

Rafael Nadal made a successful debut in Olympic singles Monday, overcoming numerous missed chances by sweeping the final four games to beat Potito Starace of Italy 6-2, 3-6, 6-2. Seeded second, Nadal will supplant Roger Federer atop the rankings next week, regardless of the outcome at the Olympics. Federer was to play his opening match later Monday.

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