Seven-time Grand Slam champion Venus Williams lost to world number 91 Wang Qiang in the first round of the French Open.
Ninth seed Williams, runner-up at Roland Garros in 2002, was beaten 6-4 7-5 by the 26-year-old Chinese player.
Williams, 37, who is due to compete in the doubles with sister Serena in Paris, went out when she sent a forehand into the net.
Meanwhile, fourth seed Elina Svitolina beat Ajla Tomljanovic 7-5 6-3.