The NCAA Tournament's second round kicks off Saturday with 16 teams battling for Sweet 16 berths after two days of upsets and buzzer beaters. Top seeds like Duke, Houston and Gonzaga face must-win situations against hungry underdogs looking to extend their Cinderella runs.

Duke's offensive struggles without Caleb Foster (40.2% 3-point shooter) and defensive vulnerabilities without Patrick Ngongba II exposed them in the first half against Siena. The Blue Devils regrouped with a zone defense and Isaiah Evans' fast-break impact to advance, but face a similar challenge against TCU, which dominated inside against Ohio State. Houston's three-guard attack of Kingston Flemings, Milos Uzan and Emanuel Sharp must handle Texas A&M's pressing style while exploiting the Aggies' defensive rebounding weaknesses.

Gonzaga takes on Texas in a clash of contrasting styles, while Michigan's size advantage over Saint Louis could prove decisive. Michigan State's frontcourt dominance against North Dakota State sets up a battle with Louisville's perimeter shooting. The Spartans' offensive rebounding prowess (top-10 nationally) should test Louisville's interior defense, especially if Mikel Brown Jr. remains sidelined with a back injury.