As protestors insisted on their rights in Tiananmen Square, Hall of Famer Michael Chang persisted in one of the hardest matches of his career: battling defending champion Ivan Lendl through cramps and doubt in the fourth round at 1989 Roland-Garros.This episode is part of the International Tennis Hall of Fame's TennisWorthy short-form series. View more TennisWorthy stories at tennisfame.com/tennisworthy.