Jaramillo's grand slam home run in the opening frame gave OSU (14-8, 2-1 Big 12) an early 4-0 lead. Dustin Majewski and Curtis Thigpen produced consecutive two-out RBI singles in the top of the third to trim the lead at 4-2.
Jaramillo's solo round-tripper in the home half of the fifth put the Pokes up 5-2. But solo home runs from Majewski, J.D. Reininger and Taylor Teagarden in the top of the sixth knotted the game at 5-5.
The Cowboys took the lead for good in the bottom of the sixth after John Urick's two-out, RBI-double scored Chris Gutierrez. OSU added three runs in the bottom of the eighth, including a Jaramillo two-run homer to produce the final score, 9-5. Texas had runners on the corners with two outs in their final at bat but were unable to stage the comeback.
Majewski and Reininger paced the Texas offense with three hits apiece.
Texas opens a three-game series against Texas Tech, Friday at 6:30 p.m. at the Disch.