Serena Williams non-committal over future after first-round Wimbledon defeat

Serena Williams waves to the crowd after what could be her Wimbledon farewell (John Walton/PA)

Serena Williams left her future open to question after her return to Wimbledon ended in a first-round defeat by little-known Frenchwoman Harmony Tan.

Stepping out to play singles for the first time since leaving Centre Court prematurely and in tears after suffering a hamstring injury in the opening round 12 months ago, Williams was rusty and error-prone.