Holders Wigan have shocked Manchester City yet again in the FA Cup, beating them 2-1 in their quarter final at the Etihad.
Jordi Gomez converted a first-half penalty and James Perch doubled their lead shortly after the break.
Samir Nasri got one back for City, who couldn't find an equaliser.
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Wigan go on to face title contenders Arsenal.
Sheffield United and Hull City will face off in the other semi-final, after they overcame Charlton and Sunderland earlier.
Arsenal manager Arsene Wenger says they're still fighting in three competitions.