Chris Brunt scored two second-half penalties to give West Bromwich a 2-1 win over Liverpool in manager Roy Hodgson's first game against his former club.
Martin Skrtel had given Liverpool the lead in the 50th minute with a strong header from a corner.
But Sotirios Kyrgiakos was adjudged to have brought down Peter Odemwingie inside the box and Brunt sent Pepe Reina the wrong way from the spot in the 62nd.
Reina then tripped Odemwingie and Brunt again converted the penalty for the winner in the 89th as West Brom remained unbeaten in five games under Hodgson, who was fired by Liverpool and replaced by Kenny Dalglish in January.
Luis Suarez again showed flashes of his quality for the Reds but Andy Carroll had a quiet game after scoring his first England goal in midweek against Ghana.
But Liverpool were the first to settle and almost went ahead after two minutes. Carroll won a header from Raul Meireles' corner and the ball fell to Dirk Kuyt whose close-range effort was blocked by Scott Carson.
Kuyt was first to react to the rebound and his shot clipped the top of the bar.
Liverpool suffered a setback after six minutes when Glen Johnson pulled up with a hamstring injury when trying to close down Brunt. He was replaced by Kyrgiakos, who went into the middle of the back four with Daniel Agger replacing Johnson at left-back.
Liverpool received another injury blow after 25 minutes when Agger hobbled off with what appeared to be a knee setback to be replaced by Danny Wilson in a straight swap at left back.
Reina was brought into meaningful action for the first time to cling on to Steven Reid's header from Brunt's deep free kick.
But Liverpool broke the deadlock after 50 minutes through Skrtel's second goal of the season. Carroll won a corner after his shot on the turn was tipped over by Carson at full stretch but he was well beaten by Skrtel's header from the resulting cross by Meireles after he had outjumped Scharner.
But Brunt scored his third goal of the campaign after Kyrgiakos tackled the impressive Odemwingie from behind inside the box. Odemwingie again shook off the challenge of Kyrgiakos before he was tripped by Reina for the second penalty, and Brunt again hammered the spot kick into the net for the win.
