Derrick James discusses his tight three-fighter stable of unified 147-pound champ, Errol Spence Jr., undisputed 154-pound champ, Jermell Charlo, and up-and-coming 135-pound spectacle, Frank Martin. #RiveraMartin is at 10pm ET/7pm PT on 12/17, LIVE on SHOWTIME. #ShoSports #ShowtimeChampionshipBoxing #Boxing #DerrickJames #ErrolSpenceJR #JermellCharlo #FrankMartin Don't miss out on the action! Visit the below links to sign up for reminders! Championship Boxing: https://s.sho.com/3oiG6RE Bellator: https://s.sho.com/3eSmXDb 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 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 Snapchat: https://www.snapchat.com/add/showtimeboxing Tumblr: http://showtimeboxing.tumblr.com/ Follow SHOWTIME Basketball: Instagram: https://www.instagram.com/showtimebasketball Twitter: https://twitter.com/shobasketball Follow ALL THE SMOKE: Instagram: https://www.instagram.com/allthesmoke/ YouTube: https://bit.ly/2OLkr50 Follow BELOW THE BELT with Brendan Schaub: Facebook: https://www.facebook.com/BelowTheBeltSHO Twitter: https://twitter.com/btbshowtime Instagram: https://www.instagram.com/belowthebelt/ YouTube: http://s.sho.com/BelowtheBelt Follow MORNING KOMBAT: Instagram: https://www.instagram.com/morningkombat/ YouTube: https://bit.ly/2lPpvsj Follow INSIDE THE NFL: Facebook: https://www.facebook.com/insidetheNFL Twitter: https://twitter.com/insidetheNFL Instagram: https://www.instagram.com/insidetheNFL/ Follow 4th and Forever: Instagram: https://www.instagram.com/4thandforever/ YouTube: http://bit.ly/30iZqSZ Follow SHOWTIME: Facebook: https://www.facebook.com/showtime Twitter: https://twitter.com/Showtime Instagram: https://instagram.com/showtime/ Youtube: https://www.youtube.com/user/SHOWTIME Official Site: https://www.sho.com/