London - Theo Walcott believes Arsenal's first-half form has been the key to the club's change in fortunes since the turn of the year.
Arsene Wenger's side travel to face Crystal Palace on Saturday looking for their eighth victory in nine games since the defeat at Southampton on New Year's Day.
That run, blemished only by defeat at Tottenham two weeks ago, has fired up the Gunners' top four challenge and earned an FA Cup quarter-final meeting with Manchester United.