RIZIN Women’s Atomweight betting trends: Favorites are 13-2 for +1.43 units and +9.5% ROI since 2024, while 2026 Unders are 3-3 for +1.59 units and +26.5% ROI.
Key Trend: Favorites Keep Winning
+9.5% ROI across 15 tracked fights
Moneyline Performance Analysis
| Bet Type | Record | Units | ROI |
|---|---|---|---|
| Favorites | 13-2 | +1.43 | +9.5% |
| Underdogs | 2-13 | -10.10 | -67.3% |
Saori Oshima and Si Woo Park both won as favorites at Landmark 15, improving the full Women’s Atomweight favorite record to 13-2. The two wins also lifted the long-term favorite return from barely positive to +1.43 units and +9.5% ROI.
Since the beginning of 2025, favorites are 10-2 for +0.66 units and +5.5% ROI. Underdogs are 2-10 over the same stretch for -7.10 units and -59.2% ROI.
The 2026 favorite sample is now 5-1 for +0.99 units and +16.4% ROI. Atomweight remains a division where favorites win at a very high rate, although the betting return depends heavily on whether the price is short enough to justify the risk.
Proposition Betting Analysis
| Bet Type | Record | Units | ROI |
|---|---|---|---|
| Over | 8-7 | -2.97 | -19.8% |
| Under | 7-8 | +0.24 | +1.6% |
Landmark 15 split the two Atomweight totals. Oshima’s first-round submission cashed the Under, while Park’s decision cashed the Over. The 2026 Under is now 3-3 for +1.59 units and +26.5% ROI.
The full totals sample remains too small and uneven to call either side a dependable long-term trend. Since 2025, Overs are 7-5 for -1.57 units and -13.1% ROI, while Unders are 5-7 for -0.74 units and -6.2% ROI.
Atomweight Betting Trends by Year
| Year | Favorite ROI | Dog ROI | Over ROI | Under ROI |
|---|---|---|---|---|
| 2024 | +25.7% | -100.0% | -47.0% | +32.8% |
| 2025 | -5.5% | -54.2% | +10.6% | -38.8% |
| 2026 YTD | +16.4% | -64.2% | -36.7% | +26.5% |
The 2026 results have moved favorites back into profit and turned the Under positive for the year. The longer-term favorite record is the more established result, while the 2026 Under return comes from only six fights.
Performance Summary
RIZIN Women’s Atomweight remains a strong favorite-win division, with favorites now 13-2 and profitable across the full sample. The 2026 Under has also returned +26.5% ROI, but that totals trend is based on only six fights and should be treated as a developing result rather than a long-term pattern.
Analysis Period: February 24, 2024 through July 18, 2026
15 betting-eligible RIZIN Women’s Atomweight fights tracked. Historical results do not guarantee future outcomes.
Combat Odds 
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