Tanner Bibee makes MLB debut with Guardians after rapid rise.

The Cleveland Guardians have promoted top pitching prospect Tanner Bibee from Triple-A Columbus, and he will make his MLB debut in today's game. In a corresponding move, left-hander Konnor Pilkington has been designated for assignment. Bibee has shown impressive command and a strong ability to miss bats in the minors, and his rapid ascension through the Cleveland system is largely attributable to a major jump in fastball velocity. The Guardians' rotation has struggled thus far, and they have begun to tap into their farm system early.