Leeds Rhinos continue to struggle near the bottom of Super League and were well beaten on Friday night by leaders St Helens.
After nine months out with a knee injury, Hull KR's Adam Quinlan made up for lost time with the decisive try against Warrington Wolves.
Warrington Wolves hammered Catalans Dragons to move six points clear of their opponents in the Super League table.
Warrington are four points behind Super League leaders St Helens after beating Wigan, but there was nothing magic about Hull FC's weekend.
Stefan Ratchford is set to miss a large portion of the Super League season as he prepares to undergo surgery.
A Super League record crowd of 31,555 witnessed Catalans Dragons cruise to a 33-16 victory over Wigan Warriors at Camp Nou.
Warrington Wolves put the pressure on Super League leaders St Helens with a comfortable win at Castleford Tigers on Friday.
St Helens and Warrington Wolves both scored 50 points in respective wins over Catalans Dragons and Huddersfield Giants on Sunday.
Super League leaders St Helens scored 11 tries in a brutal thrashing off Hull FC, whose city rivals were also giving a hammering.
Regan Grace scored a hat-trick of tries as St Helens moved four points clear in Super League thanks to victory over rivals Wigan Warriors.