IBF Welterweight World Champion Errol "The Truth" Spence Jr. and WBC Welterweight World Champion "Showtime" Shawn Porter went face to face Tuesday in Los Angeles at a press conference to preview their 147-pound championship unification that headlines a FOX Sports PBC Pay-Per-View on Saturday, September 28 from STAPLES Center in Los Angeles. (photos by Ryan Hafey)

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Also in attendance at Tuesday's press conference, and competing in pay-per-view action beginning at 9 p.m. ET/6 p.m. PT were WBC Super Middleweight World Champion Anthony Dirrell and unbeaten former champion David Benavidez, who meet in a 168-pound title fight, unbeaten contenders Mario Barrios and Batyr Akhmedov, who battle for the WBA Super Lightweight title, and rugged veteran Josesito Lopez and brawler John Molina Jr., who battlein a 10-round welterweight fight.

The event also featured former three-time world champion Robert Guerrero and unbeaten super welterweight prospect Joey Spencer, who compete in separate attractions as part of FOX Sports PBC Pay-Per-View Prelims on FS1 and FOX Deportes beginning at 7:30 p.m. ET/4:30 p.m. PT. Guerrero will face Jerry Thomas in a 10-round welterweight bout.

Tickets for the event, which is promoted by Man Down Promotions, TGB Promotions and Shawn Porter Promotions, are on sale now and can be purchased at AXS.com.