By the dinner break yesterday had made their way through to 173-6 as Rance again found success.
The medium pacer picked up three top order wickets, while Henry Collier (35) and Rayner (20) fell when they were most needed, leaving Fraser (74 not out off 47 balls) to once again hold the line, with the team clinging on to a lead of 51.
A number of batsmen had a weekend to forget. After Max Carroll fell in the second over on Saturday, Brett Cameron (34) and Collier (26) hit some streaky shots but nonetheless negotiated their team through to 40-1 at first drinks.
But when wicketkeeper Lyttle took a great one-handed catch after Collier tried to sweep a delivery off his pads, the rot set in.
New captain Bryce Grant lost his stumps to Jamie Holmes while both the debuting Dan Gordon and then later Dominic Lock were beaten by Rance for golden ducks.
Fraser and Rayner put together a middle order recovery but Rance bowled straight and true to get Fraser in front as one of his three LBW decisions.
Wanganui's tail folded in only a few overs, with Trent Hemi picking up a wicket in reply for the home team before the rain came.
Henry Cameron picked up where he left off yesterday morning by providing something both teams with their deficiencies need - a true anchor batsman. When he finally fell to a good ball from Robbie Power, Treseder and Lyttle cut loose with some big sixes, including one into the City College swimming pool and another hooked away off a Nick Blundell no-ball.
However, Blundell got Treseder caught by Lock while Wanganui's spinners managed to entice Wairarapa's tailenders into playing their shots. Gordon picked up Lyttle then added Rance after a good juggling catch by Carroll.
With a lead of 120 and only one wicket left Wairarapa chose not to declare at the lunch break, but still had Wanganui working hard to survive by the late afternoon.
Carroll and Gordon again fell cheaply to Rance, while Collier and Fraser put on a decent 62-run partnership. By press time, Fraser was batting with the tail to increase the slender lead.