UFC 306 should be fascinating, if only for the much-hyped production the Ultimate Fighting Championship plans to put on inside the Sphere on Saturday in Las Vegas, but the matches themselves should make for a good time; and some strange choices in bout order have led to some engaging stuff on the prelims. Two interesting fights bookend the undercard. The top prelim sees Irene Aldana—fresh off a surprising “Fight of the Year” contender against Karol Rosa in December—take on Norma Dumont in a clash that could put the winner in the women’s bantamweight title picture, while the opener serves as the latest test for bantamweight wunderkind Raul Rosas Jr.