West Brom midfielder Darren Fletcher thinks the game plan to frustrate Manchester United worked to perfection in the 1-0 win at Old Trafford.
Fletcher, who left Old Trafford for the Baggies earlier this year, oversaw a win which came thanks to Chris Brunt's free kick, which was deflected in by teammate Jonas Olsson.
Robin van Persie, making his first start since Feb. 21, then missed a penalty for the hosts shortly after the Baggies took the lead.
Defeat leaves United in danger of missing out on an automatic Champions League spot, while West Brom are on a three-match unbeaten run.
"We knew it was going to be difficult," Fletcher told Sky Sports. "But everyone defended for their lives. It was fantastic.
"We frustrated them. We always believed we'd score off a chance or set-piece; thankfully that worked today.
"We spoke about trying to win individual battles. Boaz [Myhill] has saved a penalty as well. Sometimes you need that. The game plan to frustrate them and sneak a goal worked."