LOAN WATCH: Gambin finally makes Red Devils debut
The Maltese international replaced Dannie Bulman on 54 minutes with the scores goalless, before Rovers won it with 20 minutes to go, Reuben Reid’s effort deflecting past Red Devils keeper Glenn Morris.
Crawley were reduced to 10 men late on when centre-back Joe McNerney was sent off for a second bookable offence.
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Hide AdJake Jervis came off the bench for AFC Wimbledon as they were beaten 2-1 by Accrington Stanley in League One.
Billy Kee put the hosts in front early on, before Sean McConville added a second on the hour.
Jervis then came on for Mitchell Pinnock on 63 minutes, with Dons back in the contest immediately, Scott Wagstaff blasting home.
The Town striker might have levelled, denied by a good Connor Ripley stop as the visitors left empty-handed.
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Hide AdCentre half Akin Famewo was an unused substitute as struggling Grimsby lost 1-0 at Stevenage in League Two.
Steve Seddon's late strike settled the encounter as the Mariners have now gone 505 minutes without a goal, since ex-Hatter Jordan Cook notched at MK Dons over a month ago.