Bencic became the highest-ranked casualty at Wimbledon so far when she stopped her match against American qualifier Julia Boserup in the second set.
Bencic was 6-4, 1-0 down on Court Three to the world number 225 who is making her Grand Slam debut.
Bencic had only completed her first round match late on Wednesday, but was impressive in her 6-2, 6-3 win against Bulgarian Tsvetana Pironkova under the Centre Court roof, with commentators tipping her as a future winner of the tournament.
Hey @WimbledonRoof ! This was LOVE at first sight tonight❤️