Wigan: (0) 16
Wigan boss Brian Noble saw his side taken apart in the first half
Tries: Calderwood, Millard, O'Loughlin
Goals: Richards (2)
Hull KR: (26) 26
Tries: Ford (2), Fisher, Dyer, Morton
Goals: Morton (3)
Super League newcomers Hull KR produced a superb first-half display as they stunned Wigan at the JJB Stadium.
Tries from Byron Ford (2), Ben Fisher, Luke Dyer and Gareth Morton helped Rovers into a 26-0 lead, with Wigan being booed off at half-time.
Wigan cut the gap to 10 points as Mark Calderwood, Shane Millard and Sean O'Loughlin went over after the break.
But Rovers produced some brave defence, with Gareth Hock twice being held up over the line, to claim the points.
The visitors had been waiting years for trips like this, and wasted no time in showing they meant business.
They were ahead inside two minutes as Ford crossed in the corner and although Gareth Morton missed the conversion he made it 6-0 with a penalty two minutes later.
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Ford scored his second try after 16 minutes when he just beat Calderwood to a kick and the visitors extended their lead when hooker Fisher wriggled over, with Morton's second goal making it 16-0.
Wigan were given a lifeline after half an hour when Rovers were reduced to 12 men as Jason Netherton was sin-binned for a late charge on Thomas Leuluai.
But the hosts could not take advantage and it was Hull KR who added two more tries, from Dyer and Morton, who also converted his score to make it 26-0 at the break.
The disgusted reaction of the Wigan faithful helped provoke the hosts into life and three tries in eight minutes from Calderwood, Millard and O'Loughlin, plus two Pat Richards conversions, saw them narrow the gap to 10 points.
Rovers also found themselves down to 12 men for the second time in the game when Chris Chester was yellow-carded.
But Wigan could not add to their tally and the visitors held on to move into an unlikely second place in the table.
Wigan coach Brian Noble:
"We were out-enthused - and that can't happen, certainly not at home. But the important thing is that we learn from it very, very quickly.
"We just can't do what we did in the first half. There was a marked improvement in the second half, but in reality it was too late.
"The first half was embarrassing. We just didn't look like a team. We did respond after half-time, but the hill was too big to climb.
"I was disappointed - we were disappointed. But it's not just about me, it's about the players as well - we owe the fans a show next week."
Hull KR boss Justin Morgan:
"I was excited coming here today. The JJB and Headingley were the two grounds I was most looking forward to coming to in terms of atmosphere and the history of the two clubs.
"I said to the players after the game that some very good rugby league teams have come here and not got the two points - and it's fantastic.
"It's nice that it's on a Friday night so we can enjoy it, but it's back to work on Monday - because we've got another easy one against Leeds next week.
"They can have Sunday off to go to church and thank God for giving them the two points."
Wigan: Ashton, Calderwood, Bailey, Vaealiki, Richards, Withers, Leuluai, Fielden, Higham, Paleaaesina, Hock, Fletcher, O'Loughlin.
Replacements: Millard, Prescott, Hansen, Hill.
Hull KR: Cockayne, Dyer, Morton, Goddard, Ford, Murrell, Webster, Vella, Fisher, Aizue, J. Netherton, Chester, Gene.
Replacements: Gannon, Ward, Smith, Gallagher.
Referee: P Bentham