Grabban grabs late winner for Palace
Neil Clement gave the hosts the lead direct from a free-kick in the first half but Republic of Ireland striker Clinton Morrison kept up his good recent scoring record when he levelled with a low right-footed effort in the 36th minute.
Palace led at half-time after Ben Watson netted from the penalty spot in the 40th minute after Michael Hughes had been brought down by West Brom substitute Martin Albrechtsen – who was sent off as a result of the challenge.