Peel 2-1 St Mary's
First half goals from Rhys Oates and Daniel Bell helped Peel to a 2-1 victory over 10-man St Mary's, as the leaders suffered their first defeat of the season.
Oates put the hosts ahead around 25 minutes in after Mary's failed to deal with a long ball forward.
It got worse for them when player-manager Alex Harrison was shown a straight red card for a foul on Matthew Skillicorn.
Peel made it 2-0 through Bell shortly after the dismissal, and despite Frank Jones halving the deficit before the break, they held on for the win.
Despite the result, St Mary's remain at the top of the Canada Life Premier League, while Peel climb to fifth.