Sam Powell kicked a huge, late drop-goal to deny Tony Smith a win in his first match since replacing Tim Sheens as Hull KR boss and seal a 19-18 win for Wigan Warriors.
The teams were level until Powell launched a massive kick from 45 metres with two minutes remaining to prevent golden point extra-time and seal a 19-18 victory for the champions.
Wigan's dramatic success took them above Huddersfield into eighth place in the Betfred Super League table on points difference.
Rovers, who missed their own drop-goal attempt through Josh Drinkwater three seconds from time, remain second-bottom despite London Broncos' upsetting leaders St Helens in equally dramatic fashion.
Smith has been out of the sport since taking charge of Warrington's final game of 2017 - against the team he is charged with keeping in the league.
Rovers trailed 14-6 at half-time but led 18-14 14 minutes into the second half thanks to tries from makeshift half-back Will Dagger and Wigan-born substitute Ryan Lannon.
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