Noah Okafor's double saw Leeds United claim their first league win at Manchester United for 45 years as the Whites took a giant leap towards Premier League safety.
Dominic Calvert-Lewin had an early chance he ought to have buried but Okafor made up for it three minutes later with a lovely first time finish. He followed that up with a deflected volley on 29 minutes to send the away end to dreamland.
Ao Tanaka, who played superbly, came inches from making it 3-0 but for a goal-saving tackle from Lisandro Martinez, having left the goalkeeper for dead.
Leeds were handed a boost on 57 minutes when Lisandro Martinez was adjudged to have pulled the hair of Calvert-Lewin. However, with now nothing to lose, the hosts surged forward with the backing from the fans.
Casemiro headed in at the back post unmarked to give the Red Devils hope on 69 minutes. The hosts pressed for an equaliser and Karl Darlow had to make a number of crucial saves with James Justin and Calvert-Lewin clearing off the line but Leeds ran out winners for the first time in more than four decades.