Arsenal have won eight and lost none of the last 10 matches in all competitions against West Ham.
The Hammers have failed to score in seven of the last nine Premier League games against the Gunners.
West Ham were the last visiting team to win a Premier League game at Highbury and the first to win at the Emirates.
Arsenal have scored in the 41st and 77th minutes in each of their last two matches against West Ham.
There have been four penalties in the last five Premier League meetings between Arsenal and West Ham.
Sam Allardyce has led a team to eight Premier League games away to Arsenal, and although he has never won (W0 D3 L5), his teams have only failed to score in one of those eight visits.
Only Liverpool and Man Utd (six each) have won away at Arsenal more often in the Premier League era than West Ham (4).
Arsenal have lost consecutive games in the Premier League for the first time since last January when they lost all three of their games in the month.
Theo Walcott has been involved in five of Arsenal's last six Premier League goals (three goals, two assists) and has scored 11 in his last 15 appearances for Arsenal (in all competitions).
West Ham have won just one of their last seven games in the Premier League (W1 D2 L4), while away from home, they've collected just one point in their last five trips (D1 L4).
