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.
Mitchell Moses went off injured in the first half and Parramatta needed a drop goal from Clinton Gutherson to finally see off Canberra.
No fans will be permitted and games will be played at neutral venues, but Super League will return on August 2.
Melbourne Storm thrashed New Zealand Warriors 50-6, but the victory came at a cost as Cameron Munster suffered a serious knee injury.
Penrith Panthers moved to the top of the NRL standings thanks to a 18-12 victory over South Sydney Rabbitohs.