Crawley made it three wins from three as they saw off 10-man Stevenage.
Stevenage led through Adam Miller's shot and, after Michael Bostwick's fine free-kick levelled, debutant Steve Morison made it 2-1 with a header.
But Stevenage goalkeeper Danny Potter was shown the red card for bringing down Lee Blackburn and Ben Strevens slotted home the resulting penalty.
And Bostwick secured three points for Crawley in the 83rd minute when he calmly curled home from 10 yards.
Stevenage: Potter, Fuller, Nutter, Oliver, Goodliffe, Miller, Hicks, Guppy (Julian 64), Dobson (Sullivan 81), Boyd, Morison (Nurse 62).
Subs Not Used: Gaia, Bulman.
Sent Off: Potter (63).
Booked: Oliver, Hicks, Fuller.
Goals: Miller 40, Morison 58.
Crawley Town: Hamer, Hiley, Danny Brown, Judge (Sattleton 41), Woozley, Mills, Bostwick, Blackburn, Scully, Edwards, Strevens.
Subs Not Used: Lovegrove, Rendell, Tolfrey, Townsend.
Goals: Bostwick 57, Strevens 67 pen, Bostwick 83.
Ref: W Barratt (Halesowen).