Craig Hall enjoyed a dream return to Hull KR as he scored twice to stun rivals Hull FC in a 20-16 derby win in their final Super League regular season match.
Hall previously represented both Hull sides but signed for Rovers on loan on Thursday, just 24 hours before the crunch clash.
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And the 30-year-old was able to inspire the visitors, set for the Qualifiers, to a first win over their rivals in eight matches after a pair of first-half tries in dreary conditions.
Rovers were dominant in the opening 40 minutes and led 16-0 at the break after Danny Tickle added to Hall's double.
Jordan Abdull crossed after the restart and Maurice Blair was sent to the sin bin for dissent before Josh Griffin and Mark Minichiello drew the hosts level.
But two Tickle kicks edged Rovers back in front as they were able to hold on for a precious win.
Elsewhere, second-placed Wigan Warriors scraped to victory over 12-man Catalans Dragons.
Kenny Edwards saw red on the stroke of half-time, but Wigan were made to wait until the closing stages before Sam Tomkins' drop goal and substitute Joe Greenwood's try clinched a 25-20 win.
Salford Red Devils also dealt well with a red card, beating Leeds Rhinos 38-22 after Lee Mossop's early dismissal as Niall Evalds scored twice.
In Friday's other match, Jermaine McGillvary scored a hat-trick to help Huddersfield Giants to an impressive 40-28 defeat of Wakefield Trinity.