Non-televised undercard coverage, plus fight analysis ahead of Erislandy Lara vs. Brian Castano-headlined tripleheader on SHOWTIME. SHOWTIME will present live streaming undercard action and pre-fight analysis on social media platforms beginning at 6:30PM ET/3:30PM PT. SHOWTIME CHAMPIONSHIP BOXING COUNTDOWN will see hard-hitting contender Edwin Rodriguez battle Mitch Williams in a 10-round cruiserweight fight, unbeaten prospect Antonio Russell square off against Mexico’s Jose Maria Cardenas in an eight-round bantamweight showdown and Leduan Barthelemy step in for an eight-round super featherweight matchup with Mexico’s Miguel Angel Aispuro. #SHOSports #LaraCastano Don't have SHOWTIME? Order now on YouTube TV: https://tv.youtube.com/welcome Subscribe to the SHOWTIME Sports YouTube channel: https://goo.gl/s8CWVT Follow SHOWTIME Sports: Facebook: https://www.facebook.com/ShoSports/ Twitter: https://twitter.com/SHOsports Instagram: https://instagram.com/shosports Snapchat: https://www