The last time the SAP Center hosted NCAA tourney games was 2007. All three games went under, although not by huge amounts:
Kansas/SIU o/u: 126.5 score: Kansas 61-58 under by 7.5
UCLA/Pitt o/u: 124 score: UCLA 64-55 under by 5
UCLA/Kansas o/u 131.5 score: UCLA 68-55 under by 8.5