Mariners' Luis F. Castillo: Booted from 40-man roster

The Mariners designated Castillo for assignment Tuesday.

The transaction frees up a spot on the 40-man roster for waiver claim Leody Taveras. Castillo has posted a 7.71 ERA, 2.71 WHIP and 5:7 K:BB across seven innings (two starts) this season during his time in the majors.