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UFC on Fox 15, a card that lived up to every bit of its promise, was all about renewal. From time to time the combat sports world must refresh itself with young challengers emerging from the battered remains of their predecessors. 

This was one of those nights.

The Machida era, well and truly, has finally come to an end. Let's all welcome our new southern Californian surfer lords. And while Luke Rockhold certainly led the way, he had a cast of new characters behind him, with Max Holloway, Paige VanZant and Beneil Dariush staking their claims as potential contenders.

It was a big night for the UFC's future—but it wasn't quite perfect. In a new post-fight series, we'll look at the card as a whole and choose the five best and worst moments—the handful of things worth talking about on Twitter in the event's aftermath.

Want to extend the bout from five rounds into infinity? That's what the comments are for. Make your voice heard.

USA Today

Luke Rockhold’s incremental climb to top contender status ended in an all-out blitz at UFC on Fox 15.

If you thought Rockhold looked impressive last November, when he dispatched Michael Bisping via second-round submission in a fight seen only on UFC Fight Pass…

Or the time before that, when he tapped Tim Boetsch in a hair more than two minutes on pay-per-view…

Or the time before that, when he crumpled Costas Philippou with a body kick TKO in the first round on Fox Sports 1…

USA Today

We said—and I include myself herethat she didn't deserve the things she was getting.

We said she received too much, too soon. She landed an exclusive Reebok deal before the champion in her division. She was lauded by Dana White and promoted and put on Fox network television, the largest platform available to the UFC.

She received all of this, we said, because of her looks. Because, as White said, she has "it."

Perhaps that's true. Perhaps she was signed by Reebok and put on Fox and pushed so heavily because she is attractive, and because she is young, and because she is a fresh face for a UFC in need of new stars. All of those things may be true.

USA Today

Perhaps the biggest and best compliment we can pay Lyoto Machida vs. Luke Rockhold is that it feels completely necessary.

In an MMA world now defined by dilution and excess, this is one we must absolutely have. When the two middleweights meet on Saturday in the main event of UFC on Fox 15, theirs will be among the most anticipated non-title fights of the year so far.

It will be steeped in meaningful stakes and will play out on the mainstream stage provided by network television.

Oh yeah, and it also stands to be a whole lot of fun.

USA Today

Even as it limps down the home stretch, UFC on Fox 15 remains the best MMA card of the month.

Yoel Romero is out, owing to a knee injury, but the UFC's second foray of the year into network television still promises to be a rollicking good time. Luke Rockhold and Lyoto Machida fight for presumed No. 1 contender status in the middleweight division, Ronaldo "Jacare" Souza promises to roll over short-notice replacement Chris Camozzi, and Cub Swanson meets Max Holloway in an interesting featherweight matchup.

With preliminary fights moving from Fox Sports 1 to the network, UFC fans will also be able to cut out any superfluous channel surfing. Just set it and forget it for the full four hours.

As usual in the case of a fight card as good as this one, bold predictions are required. Luckily for all involved, Bleacher Report Lead Writers Chad Dundas (that's me) and Jonathan Snowden have them to spare.

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The news that Phil Davis has agreed to a multiyear deal with Bellator should not come as a surprise to anyone. But it is a further indication that the landscape of mixed martial arts has changed since the 2014 ousting of Bjorn Rebney and his replacement by longtime promoter Scott Coker.

Bellator vs. the Ultimate Fighting Championship is not a true competition. Not yet. There are a good many miles between where Bellator currently sits and where they need to go in order to be taken seriously as a major threat. The UFC is still a brand name for mixed martial arts, and that is a hefty thing to overcome for any company looking to make some noise in the space.

And the departure of Davis does not even begin to signal a death knell. The UFC had the option (as they do with every single one of their contracts) to match any offer Davis received from Bellator, and they elected not to exercise the option.

That should tell you all you need to know about the UFC's thoughts on Davis. If they considered him an important player, he'd be back in the UFC fold no matter what Bellator offered him. One look at the 2014 situation with Gilbert Melendez will tell you that the UFC doesn't mind paying handsomely to match outside offers, if only they consider the fighter worth matching.

USA Today

The sudden withdrawal of Yoel Romero from UFC on Fox 15 leaves a hole that just can’t be filled.

Anybody who has seen the hulking Olympic wrestler compete, or even just walk into a room, can tell you that. His stocky, heavily muscled frame, newsboy fashion sense and quirky fighting style all cut Romero a unique profile in MMA.

With the possible exception of Chris Camozzi, nobody is better off without him—not fans, not the UFC itself and especially not his erstwhile opponent, Ronaldo “JacareSouza.

Their co-main event on Saturday was to be one of the month’s most anticipated bouts. It was a big part of why this weekend’s free network television fight card was regarded as superior to April 25’s UFC 186 pay-per-view, even before the injuries and the court orders hamstrung the latter.

RW/MediaPunch/Associated Press

Saturday's UFC on Fox event from New Jersey is a breath of fresh air. It is a beacon shining in the night, smack dab in the middle of a mostly dreadful Fight Pass card and UFC 186, which might very well be the fight card that tests just how low the promotion's pay-per-view bottom can go.

You've got Luke Rockhold vs. Lyoto Machida, the handsomest fight in UFC history. The winner of that bout will likely move on to fight the winner of next month's Chris Weidman vs. Vitor Belfort bout, which will be Weidman.

The co-main event features Jacare Souza against Chris Camozzi, which is far less awesome than the original fight between Souza and hulking Cuban wrestler Yoel Romero but still offers a chance to see Souza maul a person in the Octagon.

And then you've got Cub Swanson vs. Max Holloway and Jim Miller vs. Beneil Dariush and Ovince St. Preux vs. Patrick Cummins and Diego Brandao vs. Jimy Hettes. It is a good card.

AP Images

When the UFC debuts in a new market, it is usually a cause for celebration. Fans thirsty for the world's biggest fight promotion are finally satiated.

That was not exactly the case on Saturday when the promotion made their initial foray into Poland with a card in Krakow. Headlined by a rematch nobody wanted between Mirko Cro Cop and Gabriel Gonzaga, the card mostly featured unrecognizable talent, and it aired on the UFC's streaming-only Fight Pass service.

There are times when cards that are terrible on paper deliver a morning/afternoon/evening of exciting fights. This was not one of them. But then the main event nobody wanted came around, and we received a reminder that mixed martial arts is an unpredictable beast unlike any other.

And now, we turn our lens on UFC Poland to figure out what we learned, what we loved and what we hated.

UFC/Associated Press

We’ve seen the future of MMA—and the future is the past.

Naturally, Tito Ortiz and Stephan Bonnar are to blame for this. When those two old codgers met last November to coast around the Bellator cage for three tepid rounds, nobody expected it to be the year’s most influential fight.

But while the action was retrograde, the ratings took us back to the glory days.

Suddenly, 40-year-old pensioners are the new hot prospects. It’s strange to think that our sport so eagerly goes in for nostalgia when its own modern history dates back less than 25 years, but as 2015 crawls past the first quarter turn, that’s what’s up.