MINNEAPOLIS – The U.S. invasion is officially underway for Tim Tszyu.

The first leg of Showtime’s upcoming spring and summer schedule features Australia’s Tszyu atop a televised tripleheader this Saturday from The Armory in Minneapolis, Minnesota. The second-generation boxer and current top junior middleweight contender faces former title challenger Terrell Gausha. Both fighters made weight for their scheduled 12-round main event.

Tszyu (20-0, 15KOs) weighed 153.4 pounds for his first career fight stateside. Cleveland’s Gausha (22-2-1, 11KOs)—a 2012 U.S. Olympian and veteran fringe contender—weighed 153.2 pounds.

The bout was previously due to take place March 19 in support of the undisputed junior middleweight championship rematch between lineal/WBA/WBC/IBF champ Jermell Charlo (34-1-1, 18KOs) and WBO titlist Brian Castano (17-0-2, 12KOs). The card was scrapped when Castano suffered a slight biceps tear, forcing a two-month delay and prompting Showtime and Premier Boxing Champions (PBC) to move Tszyu-Gausha to its own event.

Tszyu is the WBO mandatory challenger and—with a win on Saturday—guaranteed to next face the Charlo-Castano winner, with their rematch rescheduled for May 19 in Los Angeles.

The co-feature bout pits unbeaten lightweights Michel Rivera and Joseph Adorno in a scheduled ten-round bout. Both boxers weighed within the contracted 137-pound limit. Rivera (22-0, 14KOs) weighed 136.4 pounds as he awaits a lightweight title shot. Adorno tipped the scales at a fight ready 136.8 pounds.

Rivera is a top-rated lightweight who is waiting out the May 28 Showtime Pay-Per-View headliner between WBA ‘World’ lightweight titlist Gervonta Davis (26-0, 24KOs) and mandatory challenger Rolando Romero (14-0, 12KOs). He agreed to a stay-busy fight, coming against Adorno who has struggled mightily with making weight but complied with contracted terms for his first fight with PBC.

Opening the Showtime tripleheader in a ten-round bout above the junior welterweight limit, Dominican prospect Elvis Rodriguez (12-1-1, 11KOs) weighed 141.2 pounds as he faces Argentina’s Juan Jose Velasco (23-2, 14KOs) who weighed 141.6 pounds.

Below are the weights for the non-televised undercard.

Bakhram Murtazaliev (19-0, 14KOs), Oxnard, California vs Grozny, Russia, 156.8 pounds vs. Ahmad Cheikho (18-7-2, 13KOs), Los Angeles via Lebanon, 159.8 pounds—10 rounds, junior middleweights

Brian Mendoza (19-2, 13KOs), Las Vegas via Albuquerque, 153.6 pounds vs. Benjamin Whitaker (15-7, 3KOs), San Antonio, 152.4 pounds—8 rounds, junior middleweights

Joey Spencer (14-0, 10KOs), Fenton, Michigan, 155.4 pounds vs. Ravshan Hudaynazarov (19-4, 14KOs), Las Vegas via Andijan, Uzbekistan, 155.8 pounds—8 rounds, middleweights

Joseph Goodall (7-0-1, 6KOs), Brisbane, Australia, 244.2 pounds vs. Matthew McKinney (8-4-2, 5KOs), Oceanside, California, 251.4 pounds—8 rounds, heavyweights

Travon Marshall (4-0, 3KOs), Capitol Heights, Maryland, 150.2 pounds vs. Timothy Parks (3-0, 2KOs), Loganville, Georgia, 150.6 pounds—6 rounds, junior middleweights

Michael Angeletti (4-0, 3KOs), Spring, Texas via New Orleans, 123.4 pounds vs. Angel Luna (15-9-1, 8KOs), The Bronx via Yamasa, Dominican Republic, 122.4 pounds—6 rounds, junior featherweights

Breeon Carothers (1-0, 1KO), Racine, Wisconsin, 135.4 pounds vs. Deljerro Revello (0-2, 0KOs), Brighton, Colorado, 135.4 pounds—4 rounds, lightweights

Jake Donovan is a senior writer for BoxingScene.com. Twitter: @JakeNDaBox