Welcome back to Teamsheet... Mail Sport's original football memory game with a twist that gives you the chance to test your football knowledge against your mates.
On Sunday, Arsenal and Chelsea will go head to head in arguably the pick of the weekend in terms of Premier League matches. Yesterday, we asked you to name the Chelsea team that lost an eight-goal thriller against the Gunners, and today we want you to name an Arsenal team that lost to the Blues back in 2009.
Chelsea were flying high at the top of the Premier League at the time, and increased their lead over their London rivals to 11 points with a 3-0 win less than half way into the season.