Photos: Marsellos Wilder Knocked Out Cold By Dustin Long

MGM Grand, Las Vegas - FOX Sports PBC Pay-Per-View Prelims on FS2 and FOX Deportes saw sensational 17-year-old prospect Vito Mielnicki Jr. (3-0, 3 KOs) deliver a stoppage of Marklin Bailey (6-6, 4 KOs) 2:31 into the second round of their welterweight affair. (photos by Stephanie Trapp, Ryan Hafey)

Plus, rising super lightweight prospect Omar Juarez (6-0, 4 KOs) dropped Kevin Shacks (3-5-3, 3 KOs) three times on his way to a TKO victory 1:59 into round six.

The opening bout of prelims saw Ukraine's Viktor Slavinskyi (11-0-1, 6 KOs) earn a unanimous decision over Mexico's Rigoberto Hermosillo (11-2-1, 8 KOs) after six rounds of super featherweight action by scores of 60-54, 59-55 and 58-56.