Arsenal beats Man Utd 2-1 in FA Cup quarterfinal . Former Manchester United player Danny Welbeck scores winner . Holders Arsenal took the lead through Nacho Monreal before Wayne Rooney equalized . Angel Di Maria sent off for shoving referee in second 2 .
Arsenal beats Man Utd 2-1 in FA Cup quarterfinal . Former Manchester United player Danny Welbeck scores winner . Holders Arsenal took the lead through Nacho Monreal before Wayne Rooney equalized . Angel Di Maria sent off for shoving referee in second half .