Tennis at the 2011 Southeast Asian Games – Men's Singles

Cecil Mamiit is the defending champion of the Men's Singles competition of the 2011 Southeast Asian Games but lost in the semifinals to Christopher Rungkat. Rungkat won the title by beating top seed Danai Udomchoke 6–2, 6–2 in the final.

Tennis at the 2011 Southeast Asian Games – Men's Singles

Cecil Mamiit is the defending champion of the Men's Singles competition of the 2011 Southeast Asian Games but lost in the semifinals to Christopher Rungkat. Rungkat won the title by beating top seed Danai Udomchoke 6–2, 6–2 in the final.