Peel beat St Mary’s on Saturday to go within four points of league leaders Corinthians.
With Laxey v Onchan postponed due to the weather, the westerners were able to leapfrog both their Railway Cup and title rivals.
With the reigning champions 1-1 with the Saints at half time after goals from Lee Gale and Mark Wolfenden, Tommy Brown scored the second half winner to claim a vital win for Peel.
Elsewhere, Braddan were denied a big win over Ayre as Leo Tregurtha equalised late on to secure a 4-4 draw for the tangerines.
In the other game in the top flight, Union Mills and Rushen drew 1-1.
Div2
RYCOB and Castletown played out an entertaining 3-3 draw on Saturday, denying the league leaders a chance to open up a bigger gap at the top of the Ardern & Druggan Division Two.
In the only other Div2 game this weekend to go ahead, St Georges won 0-2 away at D&D.