2010 is last time. That team went 47-8 in regular season and ended year 50-13 losing all three games in Big XII tournament and then crashing out as the number 2 overall seed to TCU in a hard fought super regional in Austin that never should have happened as both of those teams should have been national seeds or at a minimum TCU should have been bracketed further down the national seed line as the opponent for the 8th or 7th seed as they were easily one of the ten best teams in the country.
So, we just need to sweep the remainder of the regular season to equal that, before the conference tourney.