Former WBO junior welterweight champion Mike Alvarado, female fighting sensation Mikaela Mayer, and 2016 Olympic gold medalist Robson Conceicao will see action on the June 30 undercard at the Chesapeake Energy Arena in Oklahoma City. The card will be headlined by WBO super middleweight champion Gilberto “Zurdo” Ramirez’s title defense against Alexis Angulo and 140-pound contender Alex Saucedo’s homecoming bout against the hard-hitting Lenny Zappavigna.

Alvarado (38-4, 26 KOs) will fight Martin Martinez (17-4-1-1, 10 KOs) in a 10-round welterweight bout, Mayer (5-0, 3 KOs) will face fellow unbeaten Sheena Kaine (5-0, 1 KO) in a six-round lightweight contest, and Conceicao (7-0, 4 KOs) will take on Gavino Guaman (5-2, 1 KO) in an eight-round super featherweight bout.

Promoted by Top Rank, tickets to this world championship extravaganza are ON SALE NOW. Priced at $200, $100, $60, $40 and $25, not including facility and service fees, tickets may be purchased at the Chesapeake Energy Arena box office, online at Ticketmaster.com, all Ticketmaster outlets or by phone at 1-800-745-3000.

Ramirez-Angulo and Saucedo-Zappavigna will be televised live on ESPN and ESPN Deportes at 9 p.m. ET, while undercard action will stream live and exclusively in the United States on ESPN+ starting at 6:00 p.m. ET. ESPN+ is the recently launched multi-sport, direct-to-consumer subscription streaming service from The Walt Disney Company’s Direct-to-Consumer & International segment in conjunction with ESPN.

“I’m really excited to be fighting alongside the champ, Zurdo Ramirez!” Mayer said. “Top Rank continues to put me on amazing cards with the best talent in boxing. Fighting in Oklahoma City is the perfect opportunity to meet more boxing fans and give them an exciting show as I continue my journey to a world championship!”

“I’ve been reconstructing my entire organization over the past three years. I am training now with one of the finest professors of the sweet science, Tony Aguilera,” Alvarado said. “I’m excited to showcase what I’ve stayed dedicated to working hard for. Come June 30, I’ll be one step closer to securing my legacy against anyone who stands in my way.”

“I am very confident of fighting in OKC. I’m having a great high-level training camp in Miami,” Conceicao said. “I’m evolving every day and I’m sure I will put on a great show for all the fans in OKC and those watching live on ESPN+.”

Also appearing on the undercard will be heavyweight knockout sensation Trey Lippe Morrison (14-0, 14 KOs) of Tulsa, Oklahoma; former amateur standout Chris Zavala making his professional debut in a four-round super featherweight bout against Tyler Pacheco (1-1, 0 KOs); Oklahoma City native Aaron Morales (2-0, 2 KOs) in a four-round bantamweight contest; and unbeaten 140-pound prospect Julian Rodriguez (16-0, 10 KOs) against Alejandro Barbosa (11-2, 7 KOs) in an eight-rounder.

Alvarado has turned his career and his life around since personal problems derailed his career, as he’s won four consecutive fights (three by knockout). In his last bout, he scored one of 2017’s best one-punch knockouts with a third-round KO over Sidney Siqueira on the Terence Crawford vs.  Julius Indongo undercard in Lincoln, Nebraska. Alvarado has been involved in multiple ‘Fight of the Year’ candidates, including the first fight of his trilogy against Brandon Rios, which won Sports Illustrated ‘Fight of the Year’ honors in 2012. Alvarado lost that fight via seventh-round TKO, but less than six months later, he outboxed Rios to win a unanimous decision.

Mayer, who is making her third ring appearance of 2018, is on the fast track to a world title shot. In her last bout, May 12 on the Vasiliy Lomachenko-Jorge Linares card in New York City, she shut out the game Baby Nansen over six rounds. The Los Angeles native opened her 2018 campaign on March 10 in Carson, California, with a 35-second knockout over Maria Semertzoglou.

In 2016, Conceicao became the first Brazilian boxer to capture Olympic gold. He is 2-0 with a pair of decision wins in 2018, with his last bout coming April 28 in Philadelphia. On that evening, he shut out the game Alex Torres Rynn over six rounds.