Guillermo Coria of Argentina retires from a match against his compatriot Juan Pablo Brzezicki during the Copa Petrobras tennis tournament at the Pampulha Yacht Club in Belo Horizonte, central Brazil, October 23, 2007. Coria, former world number three, returned to competition after 13 months of inactivity due to shoulder problems, but retired from the match after losing the first set 3-6 and complaining of pain. REUTERS/Washington Alves (BRAZIL)