RIZIN Men’s Bantamweight betting trends: 2026 underdogs are 6-5 for +3.56 units and +32.4% ROI, while the Under has improved to 6-5 for +1.93 units and +17.5% ROI this year.
Top 2026 Trend: Underdogs
6-5 through 11 fights
Moneyline Performance Analysis
| Bet Type | Record | Units | ROI |
|---|---|---|---|
| Favorites | 33-13 | +7.46 | +16.2% |
| Underdogs | 13-33 | -9.30 | -20.2% |
| Coin-Flip Favorites | 7-4 | +2.34 | +21.3% |
| Coin-Flip Underdogs | 4-7 | -1.70 | -15.5% |
The full RIZIN Bantamweight sample still favors favorites, but 2026 remains a very different market from 2024. Favorites are 5-6 this year for -4.32 units and -39.2% ROI.
Underdogs are 6-5 over the same 2026 stretch for +3.56 units and +32.4% ROI. Since the beginning of 2025, dogs are 11-18 for +1.11 units and +3.8% ROI, while favorites are 18-11 for -2.56 units.
Proposition Betting Analysis
| Bet Type | Record | Units | ROI |
|---|---|---|---|
| Over | 29-17 | +0.62 | +1.3% |
| Under | 17-29 | -13.54 | -29.4% |
Landmark 15 added three Bantamweight Under wins, changing the 2026 totals picture. The Under is now 6-5 for +1.93 units and +17.5% ROI this year, while the Over has fallen to 5-6 for -3.35 units and -30.5% ROI.
The longer-term record still points in the opposite direction. Since 2025, Unders are 11-18 for -7.18 units and -24.8% ROI. Across the full sample, the Under is 17-29 for -13.54 units and -29.4% ROI.
Bantamweight Betting Trends by Year
| Year | Favorite ROI | Dog ROI | Over ROI | Under ROI |
|---|---|---|---|---|
| 2024 | +58.9% | -61.2% | +0.6% | -37.4% |
| 2025 | +9.8% | -13.6% | +21.5% | -50.6% |
| 2026 YTD | -39.2% | +32.4% | -30.5% | +17.5% |
The 2026 sample has reversed both of the division’s earlier patterns. Underdogs are profitable after favorites dominated 2024, and the Under has turned positive for the year after losing heavily in both 2024 and 2025.
Performance Summary
RIZIN Bantamweight is now one of the clearest examples of a division where the current season differs sharply from the long-term record. Underdogs are the strongest 2026 moneyline trend at +32.4% ROI, while the Under has also moved into profit for the year. The broader historical data still favors favorites and shows the Under as a long-term losing side.
Analysis Period: February 24, 2024 through July 18, 2026
46 betting-eligible RIZIN Men’s Bantamweight fights tracked. Historical results do not guarantee future outcomes.
Combat Odds 
Leave a comment