Day's 65th-minute opener, a free-kick curled in from just outside the box, was his first goal in 19 months.

Nine minutes from time Day repeated the feat following a foul.

Defeat deepened Wrexham's relegation fears, which were worsened by fellow strugglers Mansfield's 1-1 draw with Bury at Field Mill.

The Stags travel to Wrexham on Saturday in what will be one of the biggest games of the season for both clubs.

Wrexham: Ward, Tremarco, Bolland, Evans, Mike Williams (Hall 82), Spender, Whitley, Spann, Llewellyn, Broughton (Duffy 75), Nicholson (Proctor 75).
Subs Not Used: Hope, Aiston.

Peterborough: Lewis, Gnakpa, Westwood, Morgan, Day, Whelpdale, Lee (Hyde 87), Keates, Boyd, Mackail-Smith (Hatch 76), Mclean.
Subs Not Used: McKeown, Blanchett, Rendell.

Booked: Keates, Hatch.

Goals: Day 65, 81.

Att: 4,103

Ref: Mike Thorpe (Suffolk).