Newly minted 126-pound world champion Mark Magsayo makes his first defense against unbeaten former champion Rey Vargas. Plus, former 122-pound champ Brandon Figueroa against Carlos Castro from the Alamodome in San Antonio. Watch as the fighters step on the scale for the final time. #MagsayoVargas is at 9pm ET/6pm PT on Saturday, LIVE on SHOWTIME. #SHOSports #markmagsayo #Reyvargas #boxing #showtimeboxing 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.snapchat.com/add/shosports Official Site: https://www.sho.com/sports Follow SHOWTIME Boxing: Facebook: https://www.facebook.com/ShoBoxing Twitter: https://twitter.com/ShowtimeBoxing Instagram: https://instagram.com/showtimeboxing Tumblr: http://showtimeboxing.tumblr.com/ Follow INSIDE THE NFL: Facebook: https://www.facebook.com/insidetheNFL Twitter: https://twitter.com/insidetheNFL Instagram: https://www.instagram.com/insidetheNFL/ Follow BELOW THE BELT with Brendan Schaub: Facebook: https://www.facebook.com/BelowTheBeltSHO Twitter: https://twitter.com/btbshowtime Instagram: https://www.instagram.com/belowthebelt/ Follow SHOWTIME: Facebook: https://www.facebook.com/showtime Twitter: https://twitter.com/SHO_Network Instagram: https://instagram.com/showtime/ Youtube: https://www.youtube.com/user/SHOWTIME Official Site: https://www.sho.com/