The unbeaten Warriors were denied a 4-0 start for the first time since 2018 after the Wests Tigers produced a statement 14-32 victory at Go Media Stadium.
The visitors overcame a hostile home crowd to snap an eight-game losing streak against the hosts and claim their first win at the venue since 2016.
The Tigers’ defence proved decisive as they withstood repeated Warriors chances, before Sunia Turuva sealed the result with a try on full-time to cap a commanding performance and hand coach Benji Marshall a landmark win.
