LAS VEGAS – Terence Crawford looked confident and relaxed when he entered the ring Wednesday afternoon at MGM Grand.

The unbeaten WBO welterweight champion appeared as part of open workouts to promote his welterweight showdown with Errol Spence Jr. on Saturday night at nearby T-Mobile Arena. Omaha’s Crawford smiled as he spoke to Premier Boxing Champions’ Ray Flores and assured a host of Spence supporters in attendance that he is about to disappoint them and solidify himself as boxing’s best fighter in the 147-pound division.

“Man, you can expect fireworks,” Crawford said. “You can expect the best Terence Crawford that you guys have seen yet. I trained tremendously hard. I’m pretty sure that he trained hard. He’s gonna come try to knock me out, I’mma try to knock him out. It’s gonna lead to an exciting fight.”

Crawford (39-0, 30 KOs) has beaten each of his seven welterweight opponents by knockout or technical knockout since he moved up from the 140-pound division five years ago. The three-division champion is also 9-0 in Las Vegas, including seven knockouts.

“I’d like to let everybody know that I’m undefeated in Las Vegas,” Crawford said, “so let’s continue that streak.”

Spence’s experience in Las Vegas has been limited to undercard appearances early in his career (7-0, 6 KOs). The DeSoto, Texas native will headline a card in “The Fight Capital of the World” for the first time since he made his pro debut in November 2012.

Spence (28-0, 22 KOs) bit back at Crawford’s fans who mocked his promotional moniker, “The Big Fish,” when Spence appeared at the open workouts more than 90 minutes after Crawford left Wednesday.

“I just wanna shut people up, especially the people behind me talkin’ that goldfish sh*t,” Spence said. “Knowing, hey, knowing it’s strap season, man down and we gonna crawfish boil this guy come Saturday night.”

Spence, 33, and Crawford, 35, will compete to become boxing’s first fully unified welterweight champion of the four-belt era. Crawford can also become the first fully unified male champion in two divisions since the establishment of the four-title system in boxing.

An equally confident Spence promised that their long-anticipated clash will provide plenty of action.

“I’m not sure you’re gonna see toe-to-toe action straight off the bat,” Spence said. “But it’s definitely gonna be a great fight. Y’all know his mentality, you know my mentality. If I push harder, you know he gonna push back even harder. If he push harder on me, I’mma push back even harder, too. So, it’s definitely gonna be a action-packed fight on both sides.

“I’m definitely gonna put on a great show and a great performance. I know he’s definitely gonna try to put on a great show and great performance. So, make sure everybody tune in on Showtime Pay-Per-View. Make sure y’all order it. It’s gonna be a great event. It’s gonna be one for the history books. This is gonna be one you’re gonna be talkin’ about for a very long time.”

Spence-Crawford is the main event of Showtime Pay-Per-View’s four-fight telecast, which costs $84.99 and is scheduled to begin at 8 p.m. EDT (5 p.m. PDT). Crawford is marginally favored to beat Spence (-160/+135), the IBF/WBA/WBC champion, according to MGM Grand’s sportsbook.

Keith Idec is a senior writer/columnist for BoxingScene.com. He can be reached on Twitter @Idecboxing.