Mariners designated RHP Brett de Geus for assignment.
The Mariners claimed Jonathan Hernandez off of waivers from the Rangers on Friday but in order to do so they had to free up a spot on their 40-man roster. Unfortunately for de Geus, that was him this time around. The 26-year-old hurler has pitched well in four appearances with the M’s this season, posting a 2.70 ERA, 1.20 WHIP and a 2/2 K/BB ratio over 3 1/3 frames. He could attract some interest on waivers.