Talented, once-beaten prospect Marvin Quintero (16-1, 12 KOs) hopes to continue his ascension through the ranks with a win over hard-hitting veteran Tyrone Harris (23-5, 15 KOs ) in a 10-round junior lightweight bout on Friday, July 31, live on ShoBox: The New Generation on Showtime (11 p.m. ET/PT, delayed on the west coast). In…