For four rounds, Raul Rosas Jr. and Raoni Barcelos were giving us exactly the kind of main event that makes staying up until stupid o’clock worthwhile.

It was competitive, technical, messy in places and increasingly compelling as Barcelos began to impose himself on the younger man. The 39-year-old was showing every bit of his experience, particularly through the grappling exchanges, and by the end of the fourth round he had put himself in control of the fight.

All three judges had Barcelos ahead three rounds to one heading into the fifth.

Then none of that mattered.

Rosas came out aggressively for the final round, forced another grappling exchange and completed a takedown. Moments later Barcelos was unconscious on the canvas in circumstances that were immediately frightening and, even after the replays, difficult to make sense of.

The official result is a fifth-round stoppage win for Rosas Jr. He deserves credit for still pushing for the finish after four hard rounds and for continuing to compete when the scorecards were against him. But the result itself became secondary almost immediately. Barcelos remained down while the medical team worked on him before eventually being transported to hospital.

Thankfully, the update afterwards was positive. The UFC confirmed that Barcelos was stable, alert and responsive, with full movement following a CT scan and comprehensive assessment. He remained under medical supervision.

After watching the way it ended, that was easily the best news of the night.

Barcelos Was on Course

Barcelos by decision was the pick going into the main event, and for 20 minutes it was looking increasingly strong.

That does not change the official result. Rosas won the fight and the prediction goes down as a loss. But it is also a pretty brutal example of why simply looking at a final W or L never tells the whole story in MMA.

Barcelos had won three of the first four rounds on every official scorecard. The fight was heading towards the decision that had been predicted before something completely unforeseen changed everything in seconds.

That is an extreme example, particularly given the distressing circumstances, but the basic principle is something MMA produces every week.

A fighter can be comfortably ahead and get caught with a minute remaining. One scramble can expose the neck. One clean shot can erase fourteen minutes of good work. An injury can happen without warning. A foul can end a fight. And when it reaches the scorecards, there is always the possibility that the judges see the action differently.

It is a sport where being right about how a fight is likely to develop does not guarantee being right about the final result.

Perez Gets the Decision

Ailin Perez over Norma Dumont was the cleanest winner-and-method result from the card, with Perez by decision landing exactly as picked.

It was not exactly a classic.

Perez got the takedown in the first and was able to make large parts of the fight uncomfortable and difficult for Dumont rather than allowing her to settle into the cleaner striking contest she wanted. The judges gave Perez all three scorecards, 29-28, extending her winning run to seven.

There was plenty of disagreement around the result afterwards, which rather neatly leads into another theme from the night.

Sometimes you are asking three people sitting cageside to interpret fifteen minutes of fighting in exactly the same way you did.

Good luck with that.

Bryczek Looked Closer Than 30-27

Rodolfo Vieira versus Robert Bryczek is another fight where the official result does not quite match how the contest felt watching it.

Vieira clearly won the first. There is very little argument there.

Rounds two and three were different. Bryczek was having considerably more success once Vieira became less effective at getting the fight down, and those were rounds that looked very winnable from this side.

The judges saw it completely differently.

All three scored the fight 30-27 for Vieira.

That is the result and it counts exactly the same as any other. It is also a reminder that close rounds are never yours until Bruce Buffer (or Justin Bernard this week) reads the cards.

There will be nights where a tight decision lands on the right side and makes a prediction look brilliant. There will be others where the opposite happens.

And Then There Are the Things Nobody Can Predict

Mahammadali Osmanli against Ilimbek Akylbek did not even get the opportunity to develop into the fight that had been analysed.

Akylbek slipped to his knees during the opening round and Osmanli charged forward with a full-force illegal knee while he was still down. Akylbek could not continue and Osmanli was disqualified.

Akylbek gets the official win. Osmanli gets the official loss.

There is not much useful analysis that can be applied to predicting an illegal knee ending a fight after little more than two minutes.

Again, sometimes these things will work in your favour. Sometimes they will not.

Saturday was very much the latter.

Hiestand Deserves His Credit

Not every miss needs an explanation, though.

Brady Hiestand against Rinya Nakamura was simply a bad read.

Nakamura was backed to win and Hiestand came back after two years away looking sharp, aggressive and completely comfortable forcing the grappling exchanges. He eventually took Nakamura’s back and finished the fight with a rear-naked choke late in round two.

No weird ending. No judges. No caveat.

Hiestand was better on the night.

Those losses are useful too, because they remind us that an opponent can simply turn up and perform better than expected.

A Rough Run Is Still Part of the Run

The prediction numbers from UFC Vegas 121 were poor.

Fred finished 3/11 on graded winners, while the Model finished 4/11. Mickey Gall against Sedriques Dumas was removed from the grading after Gall withdrew and Luis Hernandez stepped in on extremely short notice, with the replacement fight taking place at light heavyweight.

There is no need to dress those numbers up.

This also makes two difficult events in succession after two much stronger cards immediately before them.

That is going to happen.

The Onchain Edge is still being built, the sample is still growing and the aim has never been to pretend that UFC fights can be predicted with certainty. They cannot.

MMA is far too volatile for that.

Sometimes several reads come together on the same card and everything looks easy. Other weeks a fighter gets disqualified, two close rounds go the other way and somebody who is three rounds to one ahead suddenly loses in circumstances nobody could possibly have modelled beforehand.

It is important not to use volatility as an excuse for every wrong prediction. A miss is still a miss. The numbers will still be recorded and the next card still has to be analysed on its own merits.

But neither should every short run be treated as proof that everything before it was right or wrong.

Keep building. Keep learning. Keep watching the fights.

There will be good runs again. There will almost certainly be another stretch like this one as well.

That is MMA.

Final Word

UFC Vegas 121 will probably be remembered for its main event.

It deserves to be remembered as a hell of a fight too. Rosas Jr. was pushed into deep water by the most experienced opponent of his career, Barcelos produced a superb performance at 39 years old, and the pair were awarded Fight of the Night.

Nobody wanted the ending that came with it.

So the prediction record can sit in the spreadsheet and wait for the next event.

The update that really mattered was the one from the hospital.

Raoni Barcelos was stable, alert and responsive. UFC

After Saturday night, that will do.