Annan beat Alloa to stay top of the Irn-Bru Scottish Football League Championship Third Division.
Ian Harty gave the home side the lead from close range 12 minutes before the break, his sixth goal of the season.
Harty then set up David Cox to give the home side a two-goal lead with a left-footed finish from inside the penalty area after 64 minutes.
Defender Scott Gibson was sent off for the hosts just six minutes later, but Alloa were unable to force a comeback.
Annan Athletic: Summersgill, Peter Watson, Gibson, Aitken, McGowan, Sloan (Muirhead 62), Jardine (Steele 74), McKechnie, Cox, Harty, Bell. Subs Not Used: Hyslop, Neilson, Jordan Atkinson.
Sent Off: Gibson (70).
Goals: Harty 33, Cox 64.
Alloa: McDowall, Michael Doyle, Gordon, Harding, Stirling Smith, Locke (Ross McCord 59), Holmes, Ryan McCord, Docherty (Wright 68), One (Campbell 68), Cawley. Subs Not Used: Forrest, McCullagh.
Booked: Ryan McCord.
Ref: William Collum