Following Serena Williams ' first-round defeat to Harmony Tan at Wimbledon, some tennis fans have called on the 23-time Grand Slam champion to retire.
The match was Williams' first singles match in over a year, having been forced to withdraw from last year's Wimbledon due to an ankle injury. She returned to action earlier this month, teaming up with Ons Jabeur at the Eastbourne International as part of her preparation for Wimbledon.
However, things did not go to plan for Williams, who lost a thrilling a three-hour contest against Tan 7-5 1-6 7-6 (10-7). And at the age of 40, some fans believe the time is right for her to retire from the sport as one of its greatest.
