Penrith Panthers moved up to second in the NRL, though there was no such joy for Brisbane Broncos, whose players were left in tears.
An independent examination has deemed the field of play acceptable at Bankwest Stadium despite recent concerns.
After falling behind, Wests Tigers scored 34 points without reply to help Michael Maguire's side record back-to-back wins.
Sydney Roosters were behind with less than 20 minutes left but roared back to down Parramatta Eels on Saturday.
Full-back Corey Thompson has joined the Gold Coast Titans until at least the end of 2022.
Cameron Smith was in fine form as Melbourne Storm became the first team to beat Newcastle Knights in this NRL season.
Peter V'landys said the league will look into the incident involving Benji Marshall and confirmed Wests Tigers face a suspended penalty.
A day after being dropped, Wests Tigers star Benji Marshall was involved in a coronavirus protocol breach.
Kalyn Ponga & Bradman Best starred for Newcastle Knights in a battle of unbeaten sides, while Gold Coast Titans claimed a long-awaited win.
The two-month NRL hiatus did nothing to slow Canberra Raiders down as they returned to action in style on Saturday.