(Undated) -- The NCAA Tournament continues tonight as the Sweet 16 gets underway. Four big time games are set to tip off tonight as four teams will look to advance to the Elite Eight this weekend. Top-seed Gonzaga will battle four-seed Arkansas while two-seed Villanova faces 11-seed Michigan. Elsewhere, two-seed Duke faces three-seed Texas Tech and one-seed Arizona battles five-seed Houston. The rest of the Sweet 16 will continue tomorrow.