Brett Hodgson began to repay Warrington's investment in him with the winning points in a thriller against Hull KR.
Rovers were leading 22-18 on the back of two tries from Clint Newton when Lee Briers came back into the game. He sent Hodgson through a hole in the exhausted Robins' defence and the former Huddersfield full-back added the conversion to clinch the Wolves' first win of the season by 24-22.
Harlequins have confounded most critics by winning their first two matches of the campaign, although it was a similarly close thing against Crusaders, for whom Jarrod Sammut scored two tries.
In Perpignan on Saturday night, Wakefield defied all predictions by regrouping after a traumatic few weeks to beat the Catalan Dragons 38-14. It was the Wildcats' first game since the announcement of new owners, a four-point deduction for going into administration and the loss to other clubs of three key players.
Trinity put all that to one side with a convincing win over last season's bottom club. Two of John Kear's typical signings from other clubs' reserves, Frankie Mariano and Chris Dean, scored two tries apiece. Sebastian Raguin did the same in a losing cause for the Catalans, whose anticipated improvement under their new coach, Trent Robinson, is clearly not going to come overnight.
Castleford finished Saturday on top of the table, thanks to an almost error-free display to beat Huddersfield 18-12. The half-back partnership of Danny Orr and Rangi Chase got the better of their opposite numbers, while Nick Youngquest provided the cutting edge with two tries. Jermaine McGillvary was the Giants' best player with two tries, the second in injury time to make the contest look closer than it was.
Hull's Mark O'Meley also managed a double in vain as Leeds became another side to record their second win of the season, 32-18 at the KC Stadium.
But Salford's high pre-season hopes are looking like an illusion after a second heavy defeat, 56-22 to St Helens. The Reds' big signing, Luke Patten, badly broke his nose and their coach, Shaun McRae, faced abuse from angry supporters. McRae hinted at big decisions this week, but denied that a possible resignation was one of them.