AVA- The Hammers, who were the better side for large parts of the contest, conceded the 1st in 19th minute, when French international Paul Pogba scored from the spot.
Brazilian Felipe Anderson leveled the match for West Ham with a low shot, 4 minutes after the break. Pogba converted another spot-kick, after Anthony Martial was brought down with 10 minutes remaining.
The win sees Man United, who had lost their last two games, climb to 5th, two points behind 4th-placed Chelsea, who play at Liverpool on Sunday.