A day after the Longhorns (39-13-1) opened with a loss to eighth-seeded Baylor, Belt provided a 2-0 lead with his eighth home run of the season. Rupp added a three-run shot off Kansas starter T.J. Walz (8-2) as the lead grew to 6-0 in the fourth inning.
Ruffin (9-2) cruised from there, striking out six in the third complete game of his sophomore season.
It was the second straight defeat for the Jayhawks (37-21), who opened with a 5-4 loss to Kansas State.
Baylor bows to Kansas State
OKLAHOMA CITY - Kansas State roughed up Baylor starting pitcher Willie Kempf on its way to a 9-4 victory Thursday at the Big 12 Tournament.
Kempf (4-5) gave up five runs and seven hits in only four innings. The Bears (28-24) trailed 7-1 before scoring three runs in the sixth.
Justin Bloxom hit his ninth home run of the season for the Wildcats (41-15-1).
