Mahe Fonua scored two tries as Hull FC ended Magic Weekend with a 28-16 derby victory over Hull Kingston Rovers at St James' Park to go two points clear at the top of Super League.
A dramatic defeat for Catalans Dragons against Wakefield Wildcats in the first of three matches in Newcastle on Sunday gave Lee Radford's side the opportunity to go out on their own at the summit.
And they seized the chance by coming from 16-10 down early in the second half to secure a fourth competitive derby win in a row against their neighbours.
Australian winger Fonua set the ball rolling when he rose to take a kick from Marc Sneyd to touch down for the opening try after six minutes and Hull KR were up against it when lost Shaun Lunt to the sin-bin for a dump tackle on Liam Watts 20 minutes in.
Curtis Naughton added a second try for Hull FC, but their arch-rivals reduced the deficit to 10-8 at half-time after Lunt returned to the fray to score and Terry Campese converted before slotting over a penalty.
Terry Campese levelled from the tee and converted a Graeme Horne try to give Hull KR a six-point lead, but Fonua helped himself to a double and further tries from Jamie Shaul and Mark Minichiello - all of which were converted by Sneyd - sealed it.
Jacob Miller's late drop-goal gave Wakefield a 25-24 victory over Catalans in a pulsating which leaves them in sixth spot.
Third-placed Catalans led 14-0 in the first half following tries from Justin Horo, Jodie Broughton and Tony Gigot, but Ben Jones-Bishop touched down either side of half-time and Miller snatched it from 50 metres out to continue Wakefield's charge up the table.
Jermaine McGillvary scored two of second-bottom Huddersfield Giants' eight tries as they hammered fifth-placed St Helens 48-20 in the other game on an enthralling final day of Magic Weekend.