Arsenal avoided an FA Cup giant-killing and spared manager Arsene Wenger further pressure with a hard-fought fifth-round victory over non-league Sutton United at Gander Green Lane. Wenger made seven changes from the side thrashed 5-1 at Bayern Munich in the first leg of their Champions League last-16 tie - and his players had enough to see off a team 105 places below them on English football's ladder. Lucas Perez's cross-shot gave Arsenal the lead after 26 minutes and Theo Walcott doubled the advantage from close range 10 minutes after the break with his 100th goal for the club.