#4 Valdez slip vs Manchester United (2017)
Marouane Fellaini's header and a vicious shot from Jesse Lingard had given United a comfortable 2-0 lead. The home side fought back through Rudy Gestede's goal in the latter stages of the match.
This set up a tense finale with Middlesbrough fans turning up the pressure as the team looked to force a draw. United did not look comfortable in defence since Gestede's goal. However, Valdez received a simple back pass and slipped just before he could clear the ball.
Onrushing Valencia stole the ball and easily guided it into the empty net. On December 31, 2016, Middlesbrough hosted Manchester United at Riverside Stadium in a league match. Experienced goalkeeper Victor Valdez, who had won the Champions League with Barcelona made a rookie error in stoppage time by gifting United right-back Antonio Valencia a goal.