Second-half tries from Chris Hankinson and Morgan Escare secured Wigan Warriors victory over lowly London Broncos.
St Helens and Warrington Wolves both scored 50 points in respective wins over Catalans Dragons and Huddersfield Giants on Sunday.
There was only one try in Wigan's game against Castleford, with Sam Powell's second-half score enough to earn the Warriors victory.
Super League leaders St Helens scored 11 tries in a brutal thrashing off Hull FC, whose city rivals were also giving a hammering.
A week on from sustaining a serious knee injury, Vieirinha came on as a late substitute to celebrate PAOK's title win after a 34-year wait.
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.
James Clare scored twice as Castleford Tigers earned Super League bragging rights over Yorkshire rivals Wakefield Trinity.
Wakefield Trinity confirmed a three-year contract extension for David Fifita on Tuesday, ending speculation over the prop's future.
Wigan Warriors must find another new coach after Shaun Edwards, previously set to take over next term, decided not to take up the post.
Marc Sneyd's golden-point drop goal sealed a thrilling 31-30 Super League success for Hull FC over Catalans Dragons.