Although second-placed Manchester City won 1-0 at relegation-threatened Wigan Athletic in an FA Cup Final rehearsal to close the gap on United to 13 points, United only need six points from their last five games to seal top spot.
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Chelsea, playing their seventh match in 19 days, showed no sign of fatigue as they won 3-0 at Fulham in a one-sided West London derby highlighted by a stunning 30-metre strike from David Luiz for the visitors' first goal.
"We were magnificent in our determination and courage to play and I am pleased with the result," Ferguson told Sky Sports.
"We have five games left, three at home and two away and the players have shown tonight how much they want to win the title."
However, West Ham manager Sam Allardyce was unhappy with United's second equaliser from Robin Van Persie, claiming the linesman missed an obvious offside call.
"We could have had a famous victory over United today, but when the assistant referee takes it away from you, it leaves me feeling very angry," he said.
"It was blatantly offside as we can all see. We would have been satisfied with a draw before the start but when you see a victory against one of the best teams in Europe taken away from you it is hard to take.
"He can see Van Persie is two yards offside, it hits the post comes to Van Persie and he should put his flag up and he doesn't."
Mohamed Diame put West Ham back in front with a brilliant low shot after 56 minutes but United levelled again when Kagawa's shot hit both posts and Van Persie, from what looked an offside position, fired home the rebound in the 77th minute.
