Serena Williams's long-awaited return to competitive tennis was left in the balance Wednesday after doubles partner Victoria Mboko was forced to retire in her opening singles match during the WTA tour…

Serena Williams will take part in her first professional tennis match in nearly four years on Tuesday after organisers confirmed the order of play at London's Queen's Club.

Serena Williams, 44, returns to action in a doubles match

Serena Williams is back on a professional tennis court