Melbourne Storm snatched a dramatic 19-18 golden-point victory over Wests Tigers, while Cronulla Sharks thumped Canberra Raiders.
With the scores level after 80 minutes in controversial circumstances, Cooper Cronk's drop goal secured Storm the win, moving them to within two points of NRL leaders Brisbane Broncos.
After Suliasi Vunivalu gave the Storm an early lead with a debut try, the Tigers hit back with debutant Josh Addo-Carr and Luke Brooks helping them to a 12-4 lead, although they failed to make use of their numerical advantage after Richard Kennar was shown a yellow card for dragging back Chris Lawrence from a scoring opportunity.
Cronk's converted try brought Melbourne back within two, before Vunivalu, moments after leaving James Tedesco on the deck with a high challenge, crossed to put the visitors ahead.
The Fiji-born wing was placed on report following replays of the incident, but the try stood, and matters were made worse when former Tigers man Marika Koroibete made it 18-12.
Kevin Naiqama's try and a penalty from Jordan Rankin sent the game to overtime, and, after the sides combined for four missed attempts, Cronk nailed the winning drop goal.
The Sharks, meanwhile, extended their winning run to four with a superb 40-16 victory over the Raiders at the GIO Stadium, taking them level with three other sides on 10 points.
Ben Barba crossed twice and James Maloney converted six of the Sharks' seven tries, scoring one himself.
The Sharks held their line well and gave the Raiders few opportunities to get forward, putting four tries on the board, Barba's double coming either side of scores from Jack Bird and Jayson Bukuya, before the hosts mustered a response.
Kurt Baptiste and Jordan Rapana went over within five minutes of one another to give the home fans hope of an unlikely comeback, but efforts from Valentine Holmes, Matt Prior and Maloney ensured the Sharks took the points.