Arsenal lost defender Carl Jenkinson in the 62nd minute for a second yellow card at the Stadium of Light.
Sunderland: Ten-man Arsenal held on for a 1-0 victory over Sunderland in the Premier League on Saturday to provisionally move fifth and stay in contention for a Champions League spot.
Santi Cazorla fired the Gunners ahead in the 35th minute after Jack Wilshere and Theo Walcott combined to set up the Spaniard on the edge of the box, and he drilled a low shot past Black Cats keeper Simon Mignolet.
Arsenal lost defender Carl Jenkinson in the 62nd minute for a second yellow card at the Stadium of Light, and Sunderland pressed for an equalizer the rest of the way.
Arsenal goalkeeper Wojciech Szczesny produced an excellent save five minutes from time to keep out Steven Fletcher's goalbound header and Sunderland defender Titus Bramble could have snatched a point seconds later but failed to direct his close-range effort at goal.