Santi Cazorla slipped and skied a penalty that would have given Arsenal a draw against West Brom.
James Morrison and Mikel Arteta’s own goal cancelled out Olivier Giroud’s first-half opener.
The loss comes at a pretty bad time.Arsenal play Dinamo Zagreb on Tuesday and they have to win to avoid exiting the Champion’s League even earlier than they normally do.
Highlights of Arsenal’s frustrating defeat …