Rocker signed with the ValleyCats in May in preparation for this year's draft, before debuting for the team at Joseph L. Bruno Stadium on June 4th. In five starts for the 'Cats, the right-hander tallied a 1.35 ERA in 20 innings pitched with 32 strikeouts, 4 walks, 11 hits, 3 earned runs, and a 14.40 K/9. Rocker earned the first professional win of his career in his final outing for the ValleyCats on July 1st, spinning 5 dominant innings, allowing 2 hits, striking out 7, walking 1, and not allowing an earned run.

"The ValleyCats are ecstatic for Kumar and his family," said ValleyCats Vice President and General Manager Matt Callahan. "We were honored to be a part of his journey and look forward to seeing him reach the big leagues. The Rangers got a good one!"

Rocker is set to join the same organization that ValleyCats skipper Pete Incaviglia made his MLB debut with. In five seasons with the Texas Rangers, Incaviglia tallied a .248 batting average with 607 hits, and 124 home runs.

The right-hander, who helped the Commodores win the College World Series Championship, went 28-10 with a 2.89 ERA in 42 appearances (39 starts) over three seasons.  He tossed a 19-strikeout no-hitter in the 2019 NCAA Super Regional against Duke.