UFC 331 has four finish-vs-durability tests bettors should not reduce to an under

UFC 331 has several fights where the first instinct is easy: both sides finish fights, so look at the under.

That shortcut is exactly where bettor-focused analysis should become more demanding.

Finishing rate is useful evidence. It is not a price, and it is not the same thing as an opponent-specific finishing probability. Four matchups on the Sept. 19 card make that distinction especially clear.

Mauricio Ruffy vs. Arman Tsarukyan: the finisher meets the durability sample

Ruffy has finished 5 of 6 archived wins in the current PropBetEdge sample. Tsarukyan has not been finished in 12 archived bouts. The bout is scheduled for five rounds.

That means three pieces of evidence pull at once: a strong finishing sample, a deeper durability sample, and extra time for either pattern to break.

A bettor who looks only at Ruffy''s 5-of-6 finish rate can overstate the under case. A bettor who looks only at Tsarukyan''s durability can understate what five rounds does to finishing opportunity. The eventual fight-goes-distance, total-rounds and method prices have to balance all three.

Full Tsarukyan vs. Ruffy preview.

Casey O''Neill vs. Eduarda Moura: 4 of 6 versus 0 finishes allowed in six archived bouts

O''Neill has finished 4 of 6 archived wins. Moura has not been finished in six archived bouts.

This is a smaller sample on both sides than Tsarukyan-Ruffy, which should make bettors more cautious, not less. A 4-of-6 finishing record is meaningful enough to identify a pattern. Six bouts without being finished is meaningful enough to identify a durability signal. Neither is deep enough to be treated as permanent.

The market question is whether the total or method price assumes the finishing pattern is stronger evidence than the durability sample — and whether that assumption is justified by the actual matchup.

Full O''Neill vs. Moura preview.

Marlon Vera vs. Charles Jourdain: both sides have established finishing histories

Vera has finished 11 of 15 archived wins. Jourdain has finished 6 of 9. Unlike some prospect matchups, both finishing rates come from larger win samples.

That gives the distance question more weight, but it still does not answer it by itself. Two fighters can both own strong finishing histories and still create a tactical matchup that lowers finishing opportunity.

This is where the price matters most. If “both finish” becomes the market''s obvious narrative, the under can become expensive enough that the data no longer provides value even when the qualitative thesis remains true.

Full Vera vs. Jourdain preview.

Alonzo Menifield vs. Iwo Baraniewski: 9 of 13 and 4 of 4

Menifield has finished 9 of 13 archived wins. Baraniewski has finished 4 of 4.

Baraniewski''s percentage is perfect; his sample is tiny. Menifield''s percentage is lower; his sample is much deeper. Those two facts should never be collapsed into a single “both are finishers” label.

For bettors, the question is how much the market rewards the 4-of-4 profile relative to the uncertainty around it. Perfect percentages are especially vulnerable to overpricing when the denominator is small.

Full Menifield vs. Baraniewski preview.

Why the same statistic means different things across these four fights

Finish rate is a ratio. Bettors need the denominator.

Ruffy''s 5 of 6 is not the same evidence as Vera''s 11 of 15. Baraniewski''s 4 of 4 is not stronger evidence simply because 100% is larger than 69%. O''Neill''s 4 of 6 means something different when the opponent also carries a six-bout durability signal.

That is why PropBetEdge keeps the sample beside the rate. A percentage without the denominator is an invitation to overconfidence.

Bettor''s Edge

These four fights make distance and method markets some of the most interesting UFC 331 surfaces before price, but they also make them dangerous to simplify.

The bettor''s job is to ask four questions every time a finish rate appears:

• How large is the sample?
• How often has the opponent actually been finished?
• Does the matchup create the same finishing conditions as the historical sample?
• Is the market already charging for the obvious narrative?

Without a verified price, none of these is an under bet. They are four places where the eventual number will have to reconcile finishing evidence with durability and uncertainty.