8-3
#10
Welterweight
5-2
Fight: Montalvo vs. O'Brien
27 JUL SUN '25 12:00 AM
main event
•
3 rounds
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Main Info
nickname
Kid Marvelous
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Forms
L
L
W
L
W
W
W
L
W
W
Nationality
USA 
USA
Age
(1996-04-21) 29
26 (1999-02-03)
Weight
(77 kg) 170 lbs
170 lbs (77 kg)
Height
(183 cm) 6′0″
5′11″ (180 cm)
Reach
(187 cm) 6′2″
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Gym
Social Media
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Win-Loss Records
Wins
8
4 KO/TKO - 36%
1 submission - 9%
3 decision - 27%
5
29% - 2 KO/TKO
14% - 1 submission
29% - 2 decision
Losses
3
1 KO/TKO - 9%
0 submission - 0%
2 decision - 18%
2
0% - 0 KO/TKO
14% - 1 submission
14% - 1 decision
Past Opponents
Show Cancelled Fights
Frequently Asked Questions About Montalvo vs. O'Brien
Which event are Justin Montalvo and John O'Brien fighting in?
They are set to face each other in FAC 30: O'Brien vs. Montalvo.
How many rounds is the Justin Montalvo vs. John O'Brien?
The bout is scheduled for a standard 3-round FAC fight.
Which organization is hosting the Justin Montalvo vs. John O'Brien?
The fight is organized by the Fighting Alliance Championship (FAC).
When is the Justin Montalvo vs. John O'Brien fight?
The fight is scheduled to take place on July 27, 2025
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