The Pilgrims were 1-0 victors over Northern Premier League promotion hopefuls Gainsborough Trinity at the Northolme courtesy of Mooney's fine 25-yard strike in the 11th minute.
United enjoyed the best of the first half but Trinity, featuring ex-Pilgrims Ashley Jackson, Fraser Preston and Dayle Southwell, ended the game strongly as substitutions began to take hold on both sides.
United: Cameron Gregory, Michael Bostwick (Jai Rowe 46), Tom Leak (Jacob Scott 84), Martin Woods, Dan Mooney, Tony Weston (Keaton Ward 61), Pemi Aderoju (Jacob Hazel 61), Sam Osborne (Harvey Tomlinson 84), Frankie Maguire, Zak Mills (Jordan Richards 70), Dylan Hill (Cameron Green 46).
Referee: James Cliffe.
Attendance: TBC.