The Red Devils, who were without suspended captain Wayne Rooney, were down as early as the eighth minute after Stéphane Sessègnon’s superb strike left David de Gea hapless in the United goal, as Louis van Gaal’s charges went into the half-time break a goal down, having failed to breach the hosts’ defence in the first 45 minutes.
Van Gaal made an inspired substitute in the interval, bringing on tall Belgian Marouane Fellaini who made an immediate impact, chesting the ball down before blasting home to equalise matters at the Hawthorns – a ground where United had not lost in 30 years.
That record was soon under threat midway through the second half as the Baggies broke through in-form striker Saido Berahino, who coolly slotted home after a fine run to restore the hosts’ lead.
United continued to press, with Robin van Persie’s snap shot rocketing off the post, before finally levelling matters with just three minutes left on the clock as Dutchman Daley Blind’s well-taken shot from range beat West Brom keeper Glyn Myhill to salvage a point for the visitors.
The draw sees United slip to sixth position on the log, ten points adrift of leaders Chelsea who they face on Sunday afternoon.