Why the Roosters are favoured to win — but the models are hiding the real danger in this match

The data gives Sydney a 72% chance. The history says Brisbane can win in Sydney by a whisker. The Broncos get back Walsh and Carrigan. And seven of the last nine meetings have gone under 51.5 points. Here’s everything you need to know before tonight.

The computers love the Roosters tonight. A 72% win probability from Dimers’ advanced model — built on machine learning and data simulation — makes Sydney clear favourites at Allianz Stadium. Home ground. Four-game winning streak. 167 points scored in their last month of football. An unchanged squad for the fourth consecutive week. The model is saying: Roosters win.

But here is what the headline number doesn’t tell you. The same data that gives the Roosters a 72% win probability also predicts this will be a grinding, defensive, low-scoring contest. The model gives a 61% chance of the total points staying under 52.5. Seven of the last nine meetings between these clubs have gone under 51.5 points. The Broncos have conceded just 18.2 points per game over their last five games. This is not set up to be another 62-16 demolition.

This is set up to be exactly the kind of tight, physical, quality-over-quantity match that the Roosters haven’t been tested by all season.

Why the models favour the Roosters

🔴 Roosters’ case

Home ground advantage at Allianz. Four-game winning streak. 167 points scored in past month. Unchanged, settled squad — same 17 for the fourth week. Walker-DCE combination hitting its peak. Nawaqanitawase with 8 tries in last 5 at Allianz. Roosters have won 6 of last 8 vs Broncos.

🟡 Broncos’ danger

Walsh and Carrigan back — instantly makes them a different team. Broncos have won last 3 games in Sydney by 4 pts or less. Conceding just 18.2 pts per game over last 5. Broncos 17-8 ATS as underdogs. Seven of last 9 meetings gone under 51.5. They held Roosters under 28.5 in 7 of last 9.

The stats you need to know

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Reece Walsh has scored a try in his last two appearances against the Roosters — and has scored in his last six games played in NSW. His return is not just significant for Brisbane’s attack. It is a specific, verified threat to the Roosters’ defensive structure.

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Daniel Tupou needs one try to join Billy Slater in third place on the all-time NRL tryscoring list. He has scored five tries in his last four games. If he scores tonight, it’s a moment of genuine NRL history at Allianz Stadium.

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Broncos’ defence: The Roosters have been held under 28.5 total points in seven of their last nine meetings with Brisbane. The Roosters have scored 167 points in four wins — but against the Sea Eagles (before Foran), the Sharks, the Knights and the Dragons. None of those sides’ defences match Brisbane’s.

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The cover spread concern: Even with 72% win probability for the Roosters, the model only gives them a 59% chance of covering the -5.5 spread. That gap — winning but not comfortably — is the Broncos’ entire game plan in a sentence.

The match-up that decides everything

Two battles define this match. The first is the one everyone is watching: Sam Walker vs Reece Walsh. Walker chasing Origin selection. Walsh returning from injury desperate to prove his fitness and remind everyone why he is the most dangerous fullback in the competition. Both players are watched closely by Billy Slater for their respective Origin sides. This is as high-stakes as a regular season individual contest gets.

The second is less glamorous but equally decisive: the forward battle. Pat Carrigan’s return from suspension brings instant punch to a pack also featuring Xavier Willison and Ben Talty. Victor Radley and Lindsay Collins for the Roosters against Carrigan, Haas and Talty for the Broncos — 80 minutes of brutal middle-thirds football that will determine which halves combination gets the platform to perform.

“Both the Roosters and Broncos have won five of their last six games — but the Broncos have developed a steely underbelly, with Michael Maguire putting an emphasis on defence.”

— bets.com.au pre-match analysis, May 2026

The verdict

72%

Win probability — Roosters

Under 52.5

Expected total points — low-scoring battle

Roosters

Predicted winner — but not comfortably

The Roosters win. Home ground, form, and the Walker-DCE combination clicking at the right time give them the edge. But this will not be comfortable, and it will not be 62-16. Expect a grinding contest in the 20-26 points range for the Roosters. Broncos to push deep into the final quarter before the class of Tedesco and Walker proves decisive.

The moment to watch: when the Broncos’ Walsh gets the ball in open space against Tedesco in the second half. That contest — two of the competition’s best fullbacks going head to head with the game in the balance — will define the match. And quite possibly Origin selections.

The models say 72%. The history says it’ll be tight. The returning stars say Brisbane are more dangerous than their 8th-place ladder position suggests. And Sam Walker says — through his football, not his words — that he belongs on the biggest stage the NRL offers. Tonight at Allianz, we find out if he’s right.