Vargas Jr with a pair of hooks to the body, but Walsh times a hook up top.

Vargas edges forward but offers nothing more than some half-feints. Walsh skips laterally into the clear.

Nice trio of shots from Vargas now, though, a one-two and a lead southpaw hook.

In the crowd, among many big names, is Mexican legend Julio Cesar Chavez. He pops up on the big screens, and the reception is huge.

Vargas Jr does well to open up a little more in this round, but his form isn’t always the best; his balance has been off in various moments.

Niceeee left hook upstairs from Walsh!

Both men trade hard hooks to the body. Vargas is warned for firing one a little low.

Walsh is doing the better work overall. He’s mixing up his targets well, keeping Vargas Jr guessing about what’s coming next.

Vargas isn’t producing enough activity, either. He’s plodding forward with a high guard but failing to throw much of note. When he does, his accuracy is lacking at the moment.

Walsh is favouring a right uppercut to the body. He landed a couple late in the first round, and that’s where he picks up in the second frame.

Now two right hooks to the head, with Vargas Jr stumbling off balance slightly. He shells up as Walsh attacks again.

Vargas Jr throws his full weight into a cross to the mid-section. He aims at the body again then steps back to evade a hook upstairs from Walsh.

The end to the round is cagy, with each boxer hesitant to open up too much. Eventually, though, it’s Walsh who produces a couple of flurries.

Walsh takes the centre of the ring, bouncing up and down. Vargas Jr holds a higher guard. Both men wing left hooks simultaneously, but neither lands clean.

Oh!! Vargas Jr drops Walsh with a straight to the body! That draws a gasp from the crowd, but Walsh is straight back up and smiling – acknowledging the shot.

It looked to be a balance issue more than anything else.

Walsh corners Vargas Jr, but the American gets free. Walsh with a few hard body shots of his own now.

A nice reception for Vargas Jr from the Vegas crowd, before Walsh makes his walk, looking a little... nervous?

Walsh, you could say, is Dana White’s pet project in boxing.

A young Irish southpaw... I wonder where White got that idea from...

In Vargas Jr’s corner is his father, a former world champion. In Walsh’s corner is Hall of Fame trainer Freddie Roach.

Time for the chief-support bout!

Ireland’s Callum Walsh, 24, takes on American Fernando Vargas Jr, 28, in a meeting of unbeaten southpaws at super-welterweight.

Then, it's Canelo vs Crawford...

It’s a draw! Some frustration in the crowds, but also appreciation of the mammoth effort from both boxers.

97-93 to Martinez, 96-94 to Mbilli, and 95-95.

Mbilli keeps his title!

Massive left hook! How is Martinez still standing?! Moreover, how is he unloading shots back?!

This one has been incredible, and it ends with both men absolutely swinging for the fences as the final bell sounds.

A RAUCOUS reception for that bell, as the fans show their appreciation for the fight of the night.

A loud cheer inside Allegiant Stadium as Canelo is again shown on the big screen.

Meanwhile, Crawford is wrapping his hands.

Both men look quite relaxed, but especially Canelo, who seemed to wear a small smile.