Casey O'Neill vs. Eduarda Moura

UFC 331 · September 19, 2026 · Crypto.com Arena · Prelims 6:00 PM ET

The brief

What kind of fight: Ranked flyweight crossroads fight
Finish likelihood: Medium
The line: No line posted yet
The stakes: Flyweight · Prelims

The read

O'Neill's momentum and finishing power make her the pick, but Moura's grappling pedigree and five submission wins mean any scramble is dangerous for the Australian.

If O'Neill can keep this standing behind her power, she should find another finish; if Moura gets this to the mat, her submission threat is live in every position.

A close, competitive fight either way.

The matchup

Casey O'Neill

Well-Rounded Finisher

No. 12 ranked · Heavy hands · Grappling background

GrapplingStriking

Eduarda Moura

Submission Specialist

No. 13 ranked · BJJ · Well-rounded

GrapplingStriking

This is a genuine top-15 flyweight matchup between two ranked contenders coming off different results.

O'Neill's power and well-rounded game were on full display in her comeback knockout of Gabriella Fernandes, while Moura's submission craft has been enough to beat a former title challenger even as she dropped her most recent decision.

Whoever wins likely moves closer to the division's contender picture.

Tale of the tape

11-2	Record	12-2
28	Age	32
5'6"	Height	5'6"
—	Reach	—
—	Stance	—
Australia	Country	Brazil
—	Team	Galpão da Luta

The numbers

Career UFC averages. Red bar = statistical edge.

Casey O'NeillEduarda Moura

—Sig. strikes landed / min (volume)—

—Striking accuracy (precision)—

—Sig. strikes absorbed / min (lower is better)—

—Striking defense (strikes avoided)—

—Takedowns / 15 min (wrestling offense)—

—Takedown accuracy—

—Takedown defense—

—Submission attempts / 15 min—

The fighters

Casey O'Neill 11-2

“King”

Casey O'Neill is a 28-year-old flyweight fighting out of Queensland, Australia and currently ranked No. 12 in the division. She returned from more than a year away from competition with a first-round knockout of Gabriella Fernandes in March 2026, and now meets fellow ranked contender Eduarda Moura in a bout that could shake up the top 15.

How they win

4 KO/TKO2 SUB5 DEC

Last 3 fights

WGabriella Fernandes · KO/TKOUFC Fight Night: Adesanya vs. Pyfer · March 28, 2026

Full O'Neill profile →

Eduarda Moura 12-2

“Ronda”

Eduarda "Ronda" Moura is a 32-year-old Brazilian flyweight training at Galpão da Luta, currently ranked No. 13 in the division. She is coming off a decision loss to Cong Wang in February 2026 that snapped a two-fight winning streak that included a win over former title challenger Lauren Murphy. She now meets fellow ranked contender Casey O'Neill in Los Angeles.

How they win

4 KO/TKO5 SUB3 DEC

Last 3 fights

LCong Wang · Decision (unanimous)UFC Fight Night · February 7, 2026
WLauren Murphy · Decision (unanimous)UFC on ESPN · July 12, 2025
WVeronica Hardy · Decision (unanimous)UFC 309 · November 16, 2024

Full Moura profile →

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