Serena Williams an injury doubt for Wimbledon doubles with Venus

Serena Williams is an injury doubt for her Wimbledon doubles appearance with sister Venus. The 23-time Grand Slam champion tweaked her right knee during a singles match against Maya Joint on Tuesday night. This marks the end of her return to singles competition after almost 1,400 days. The physical toll of her first singles match has now put the potential fairytale doubles return with Venus in doubt, leaving her participation in the tournament uncertain.