Serena Williams’ doubles partnership in doubt after Victoria Mboko injury

• Mboko forced to retire in singles match at Queen’s

• Duo are due to play next on Thursday evening

The future of Victoria Mboko’s doubles partnership with Serena Williams was plunged into doubt after the Canadian was forced to retire in her opening singles match at the HSBC Championships in London.

Williams, 44, made her comeback to tennis on Tuesday, securing a win alongside Mboko in their first doubles match.