Another world title at welterweight is on the line on the Mikaela Mayer vs. Sandy Ryan 2 undercard while prospects continue to enhance their skills. Here's a breakdown of all the action.

Two women's welterweights go head-to-head in a rematch in "Sin City:" Mikaela Mayer (20-2-0) defends her WBO women's welterweight title against Sandy Ryan (7-2-1) in a rematch. The pair faced off last September in a very heated and contentious match with Mayer winning in a decision.