Co-Main Event

What is a co-main event?

The co-main event is the fight directly before the headline main event, sitting at the top of the main card. On a typical UFC pay-per-view, the order climbs from prelims to a five-fight main card, and the co-main is the fourth of those five bouts, one slot below the fight that closes the show.

The name comes from the prefix “co-“, meaning together or alongside. Promoters use it to signal that the bout is billed close to the main event, not that the card carries two headliners of equal rank. There is still one true headliner, and the co-main is the strong supporting fight placed just beneath it.

Because of that billing, the co-main slot usually goes to a title fight, a former champion, a ranked contender, or a name with real drawing power. It gives a card depth and reassures fans that the night has more than one bout worth staying up for.

Where the co-main event sits on a fight card

A full UFC card is split into sections that build across the evening. The early prelims open the show, and the prelims raise the stakes before the main card delivers the marquee bouts. The co-main is the penultimate fight overall, and the last one before the main event walkout.

Card section	Where it sits	What it usually holds
Early prelims	Opening fights	Newcomers and prospects
Prelims	Before the main card	Rising contenders, veterans, some ranked names
Main card	Headline section	The biggest fights of the night
Co-main event	Second-to-last fight	The second-biggest bout
Main event	Final fight	The top-billed headliner

Fight order depends on more than rankings. A fighter’s drawing power and what is at stake in the division both push a bout up the card, which is why a big name can take the co-main slot over a higher-ranked opponent.

Co-main event vs main event

These two bouts sit side by side at the top of the card, and casual fans mix them up. The main event is the single headliner, listed last and used to promote the whole show. The co-main runs immediately before it and takes second billing.

Detail	Co-main event	Main event
Position	Second-to-last fight	Final fight of the night
Billing	Second-biggest bout	Top-billed headliner
Rounds	Three, or five for a title	Five
Used to promote the card	Sometimes	Almost always
Backup role	Can be promoted to headliner	Not applicable

This clears up a question that trips people up. If the last fight is the “main,” why is the one before it a “co-main” rather than a second main? The prefix marks a fight billed alongside the headliner in importance, but the card still crowns a single main event as the bout that closes the night.

How many rounds is a co-main event?

By default, a co-main event runs three rounds, the standard length for a non-title UFC bout. When a championship is on the line, that same slot is scheduled for five rounds, matching the length reserved for title fights and main events.

The UFC has occasionally broken from that pattern for a marquee non-title co-main. The most talked-about case was the Nate Diaz versus Leon Edwards booking, set as the promotion’s first five-round non-title fight outside the main event, though an injury later moved it off the co-main slot. Away from those rare exceptions, the rule holds steady: a title makes it five rounds, and everything else runs three.

Why the co-main event matters

A strong co-main can make a whole card feel bigger. On a stacked pay-per-view, it sometimes plays like a second headliner, giving the promotion two fights to sell instead of one.

The slot also works as insurance. Main events fall apart with some regularity in MMA, whether through injury or a failed weight cut, and a strong co-main gives the card a ready replacement headliner if the top bout collapses. That safety net is one reason promoters put an important fight in the slot rather than filler.

For fans reading a card, the co-main is a quick gauge of quality. A weak one hints at a thin night. A co-main that could headline its own event is a sign the whole card is worth the ticket.

Frequently Asked Questions

Why is it called a co-main event and not a second main event?

The prefix “co-” means alongside or together, so it marks a fight billed close to the headliner. A card still has one main event, the fight listed last, with the co-main as its lead-in.

Is the co-main event before or after the main event?

Before. The co-main is the second-to-last fight of the night and runs directly ahead of the main event, which always closes the show.

Does every UFC card have a co-main event?

Most do, though the term carries the most weight on numbered pay-per-view cards. Any event with a defined main card will have a bout billed as the co-main directly beneath the headliner.

Can a co-main event become the main event?

Yes. If the scheduled main event falls through late, the co-main can be promoted to headliner, which is part of why a strong fight is placed there.

Is co-main event a boxing term too?

Yes. Boxing and other combat sports use the same structure. When two bouts share near-equal top billing, a card is sometimes promoted as a double main event or double-header.

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Sources

1. World in Sport. “UFC Main Card Explained: How Fight Order, Prelims and Start Times Work.” Accessed August 2026.
   https://worldinsport.com/ufc-main-card-explained/
2. SportsLingo. “What Is A Fight Card In Boxing & MMA? Definition & Meaning.” Accessed August 2026.
   https://www.sportslingo.com/sports-glossary/f/fight-card/
3. ESPN. “UFC 263 viewers guide: Title fights are great, but Leon Edwards-Nate Diaz might steal show.” Accessed August 2026.
   https://www.espn.com/mma/story/_/id/31585471/ufc-263-viewers-guide-title-fights-great-leon-edwards-nate-diaz-steal-show
4. Yahoo Sports. “UFC 263 results: Leon Edwards batters Nate Diaz, survives near finish in final minute.” Accessed August 2026.
   https://sports.yahoo.com/ufc-263-results-leon-edwards-035918991.html
5. Sportskeeda. “How many rounds are there in a UFC fight?” Accessed August 2026.
   https://sportskeeda.com/mma/news-how-many-rounds-ufc-fight

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