Wigan and Warrington shocked
A review of Sunday's action in the First Utility Super League, including shock wins for Bradford and Wakefield.
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Riley, who has been on loan at Belle Vue after playing for Warrington in their opening game of the season, crossed twice in the first half and added another after the break to stun the Wolves.
Richie Mathers, another ex-Warrington player, scored the Wildcats' sixth try to seal a deserved win for Wakefield - their first against the Wolves in 10 attempts.
Tries from Danny Williams, Joe Arundel and Matty Blythe ensured Bradford claimed their first victory since the beginning of June, with a brace from Dom Manfredi only scant consolation for Shaun Wane's visitors.
The two points are almost academic for the Bulls, who were relegated after defeat at Huddersfield last time out, but Wigan's fifth defeat in West Yorkshire this season could prove costly in the race for top spot, as they now trail leaders St Helens by four points with five rounds remaining.
McGillvary touched down in each half to take his total for the season to 17 while centre Joe Wardle also got two tries as the Danny Brough-inspired Giants bossed the show to clinch a 38-16 win over their French visitors.
The match continued the dismal away form of the Dragons, who have lost just twice in the south of France this year but have only managed to beat relegated sides London Broncos and Bradford on their travels.