Roger Federer defeated Argentina's ex-world number three Juan Martin del Potro 3-6, 7-6, 19-17 in the semi-finals of tennis' men's singles event in 2012 London Olympics. August 3, 2023 marks 11 years since Federer's triumph. The encounter recorded tennis' longest three-set match, lasting four hours and 26 minutes. "That was my last chance to win a medal," Juan had stated.