# Super League Round 21 2025 Predictions & Tips — Alphr > Free AI Super League predictions for Round 21 of the 2025 season — 6 matches, every head-to-head, line, margin and totals pick published before kick-off and verified after full time. Quote with attribution to Alphr (alphr.com.au). ## Round 21 at a glance - 6 matches · 14W–10L on 24 settled picks (58% strike rate) · best value +28.8% edge ## Round 21 predictions | Match | Model pick | Win prob | Result | |---|---|---|---| | Leigh Leopards v Leeds Rhinos | Leigh Leopards | Leigh Leopards 63% | LOST | | Warrington Wolves v Wigan Warriors | Wigan Warriors | Warrington Wolves 64% | WON | | Wakefield Trinity v St Helens | St Helens | St Helens 60% | WON | | Hull KR v Castleford Tigers | Hull KR | Hull KR 85% | WON | | Huddersfield Giants v Catalans Dragons | Catalans Dragons | Catalans Dragons 53% | LOST | | Hull v Salford Red Devils | Hull | Hull 81% | WON | ## Match-by-match ### Leigh Leopards v Leeds Rhinos Thu, 07 Aug, 10:00 am AEST · Progress with Unity Stadium · Round 21 Alphr AI win probability: Leigh Leopards 62.8% / Leeds Rhinos 37.2% - **Head to Head:** Leigh Leopards to win — model probability 62.8% — result: LOST - **Line / Spread:** Leigh Leopards — model probability 62.8% — result: LOST - **Margin Band:** Leigh Leopards 1-12 — model probability 62.8% — result: LOST - **Total (Over/Under):** Over — model probability 50.0% — result: LOST - Predicted margin: Leigh Leopards by 4 · Predicted total: 43 Full breakdown: https://alphr.com.au/super-league/match/2025-r21-leigh-leopards-v-leeds-rhinos ### Warrington Wolves v Wigan Warriors Fri, 08 Aug, 10:00 am AEST · Round 21 Alphr AI win probability: Warrington Wolves 64.0% / Wigan Warriors 36.0% - **Head to Head:** Wigan Warriors to win — model probability 64.0% — result: WON - **Line / Spread:** Wigan Warriors — model probability 64.0% — result: WON - **Margin Band:** Wigan Warriors 1-12 — model probability 64.0% — result: WON - **Total (Over/Under):** Over — model probability 50.0% — result: WON - Predicted margin: Wigan Warriors by 9 · Predicted total: 43 Full breakdown: https://alphr.com.au/super-league/match/2025-r21-warrington-wolves-v-wigan-warriors ### Wakefield Trinity v St Helens Fri, 08 Aug, 10:00 am AEST · The Diy Kitchens Stadium · Round 21 Alphr AI win probability: Wakefield Trinity 40.0% / St Helens 60.0% - **Head to Head:** St Helens to win — model probability 60.0% — result: WON - **Line / Spread:** St Helens — model probability 60.0% — result: WON - **Margin Band:** St Helens 1-12 — model probability 60.0% — result: LOST - **Total (Over/Under):** Under — model probability 50.0% — result: WON - Predicted margin: St Helens by 0 · Predicted total: 38 Full breakdown: https://alphr.com.au/super-league/match/2025-r21-wakefield-trinity-v-st-helens ### Hull KR v Castleford Tigers Sat, 09 Aug, 10:00 am AEST · Sewell Group Craven Park · Round 21 Alphr AI win probability: Hull KR 84.7% / Castleford Tigers 15.3% - **Head to Head:** Hull KR to win — model probability 84.7% — result: WON - **Line / Spread:** Hull KR — model probability 84.7% — result: WON - **Margin Band:** Hull KR 13-24 — model probability 84.7% — result: LOST - **Total (Over/Under):** Over — model probability 50.0% — result: WON - Predicted margin: Hull KR by 15 · Predicted total: 41 Full breakdown: https://alphr.com.au/super-league/match/2025-r21-hull-kr-v-castleford-tigers ### Huddersfield Giants v Catalans Dragons Sat, 09 Aug, 10:00 am AEST · ACCU Stadium · Round 21 Alphr AI win probability: Huddersfield Giants 47.3% / Catalans Dragons 52.7% - **Head to Head:** Catalans Dragons to win — model probability 52.7% — result: LOST - **Line / Spread:** Catalans Dragons — model probability 52.7% — result: LOST - **Margin Band:** Catalans Dragons 1-12 — model probability 52.7% — result: LOST - **Total (Over/Under):** Under — model probability 50.0% — result: WON - Predicted margin: Catalans Dragons by 1 · Predicted total: 39 Full breakdown: https://alphr.com.au/super-league/match/2025-r21-huddersfield-giants-v-catalans-dragons ### Hull v Salford Red Devils Sun, 10 Aug, 10:00 am AEST · MKM Stadium · Round 21 Alphr AI win probability: Hull 81.4% / Salford Red Devils 18.6% - **Head to Head:** Hull to win — model probability 81.4% — result: WON - **Line / Spread:** Hull — model probability 81.4% — result: WON - **Margin Band:** Hull 13-24 — model probability 81.4% — result: LOST - **Total (Over/Under):** Over — model probability 50.0% — result: WON - Predicted margin: Hull by 14 · Predicted total: 49 Full breakdown: https://alphr.com.au/super-league/match/2025-r21-hull-v-salford-red-devils ## Model performance (2025) | Model | Market | Strike rate | Record | |---|---|---|---| | Head to Head | Win/Loss | 71.1% | 118/166 | | Spread / Line | Spread | 72.3% | 120/166 | | Margin Band | Margin Band | 22.3% | 37/166 | | Over/Under | Total Score | 49.1% | 82/167 | | Anytime Try Scorer | Try Scorer | 32.6% | 392/1202 | | First Try Scorer | First Try Scorer | 7% | 58/825 | ## More Super League predictions - Previous round: https://alphr.com.au/super-league/2025/round/20 (markdown: /super-league/2025/round/20.md) - Next round: https://alphr.com.au/super-league/2025/round/22 (markdown: /super-league/2025/round/22.md) - All Super League rounds & tips: https://alphr.com.au/super-league (markdown: /super-league.md) --- Canonical URL: https://alphr.com.au/super-league/2025/round/21 RSS feed: https://alphr.com.au/feed.xml Prediction JSON API: today https://alphr.com.au/api/predictions/today · this week https://alphr.com.au/api/predictions/weekly Markdown view for AI agents. Machine-readable index: https://alphr.com.au/llms.txt · full reference: https://alphr.com.au/llms-full.txt All predictions are published before kick-off and verified after full time. Free, no login. 18+ gamble responsibly (AU). Last updated: 2026-06-20 10:12 UTC (latest tip update)