Man United are the even money favourites to lift the FA Cup, say Ladbrokes.
Bolton Wanderers are 5/1 having reached the semi-final stage, with Manchester City splitting the two teams at 5/2.
United are 18/1 to complete the Treble by taking the Premier League, FA Cup and Champions League crowns.
They are 5/1 to finish the season without silverware.
Arsenal are now 4/11 to endure another trophy-free season with hopes now resting on hauling back United in the league.
David Williams of Ladbrokes said: “Arsenal’s season is now hanging by a thread. In the blink of an eye, talk of a quadruple has been reduced to a scramble for just one trophy.
“United fans will surely now view the FA Cup as being at their mercy.”
How many trophies this season for Man United:
Arsenal to win a trophy:
FA Cup outright
Evs Man United
5/2 Man City
5/1 Bolton Wanderers
12/1 Stoke City
14/1 West Ham