LONDON, United Kingdom (AFP)—Serena Williams’ bid to win the Queen’s Club doubles title on her return to tennis came to a premature end on Thursday after the American legend’s partner Victoria Mboko was forced to withdraw from the tournament.

Williams sensationally returned to action on Tuesday for the first time in four years, partnering with Mboko for a straight sets victory over Nicole Melichar-Martinez and Erin Routliffe in the first round.

The pair were due to play Leylah Fernandez and Laura Siegemund in the quarter-finals of the grass-court event in west London on Thursday.