The second-most penalised team in the competition, the Waratahs were again their own worst enemies on Saturday while slumping to a 13th consecutive defeat in clashes across the Tasman despite a late rally.
A bewildered Dan McKellar looked a beaten man in the Waratahs' coaching box as his side continually handed over possession and territory with dumb penalties, in the first half especially.
The upshot from a third-straight loss, and eighth of another wildly erratic 2026 campaign, is the Waratahs will almost certainly need to win their last three games of the regular season to squeeze into the finals.
That looks a tall order heading to Suva next round to face the Fijian Drua, before hosting the ACT Brumbies and finishing in Perth against the Western Force, who the Waratahs lost to last week in Sydney.
McKellar inherited a Wallabies-laden squad when he took over from Darren Coleman at the end of 2024.
But he will need to work wonders for the Waratahs to avoid missing finals action for a second straight year on his watch.
The Highlanders played half an hour of the match a man down after wrecking-ball skipper Timoci Tavatavanawai was yellow-carded for a cynical challenge at the ruck and then his centre partner Jona Nareki saw red for a second-half shoulder to Jack Barrett's head.
But the writing was on the wall early for the Tahs after Jonah Lowe cashed in on some excellent footwork work from fellow Highlanders winger Caleb Tangitau to bag the first try after Suaalii rushed up out of the defensive line and missed his man in the sixth minute.
Tangitau did it all himself for the Highlanders' second try, collecting the ball from the back of a ruck and beating four NSW defenders - Angus-Scott Young, Pete Samu, Jake Gordon and Angus Blyth - to score in a hell of an opening 10 minutes for the All Blacks hopeful.
When Jacob Ratumaitavuki-Kneepkens crossed, the Waratahs trailed 21-0 inside 20 minutes.
"The first 20 minutes killed us really," McKellar said.
The visitors received a lifeline into the contest when the Highlanders lost Tavatavanawai and they capitalised immediately with Suaalii and Max Jorgensen combining to put Andrew Kellaway over.
But the reprieve was short-lived as Lowe nabbed his second to give the Highlanders a 28-7 lead at the break.
The Waratahs fought back and kept the Highlanders scoreless until the final minute of the second half.
But their two tries came all too late from Apolosi Ranawai and Sid Harvey - after Harvey had dropped the ball with the line beckoning and Suaalii had one disallowed.
"I'm incredibly proud of the fight the boys showed and we had opportunities to win that game. That's the harsh reality. We left at least three tries out there." said McKellar.
"But we came here with the mindset to want to attack and use the ball and we certainly did that.
"But one-on-one missed tackles and a set-piece doesn't function, you're not going to win in New Zealand."
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