Mariners Acquire Casey Legumina, Designate Jhonathan Díaz

The Mariners announced that they have acquired right-hander Casey Legumina from the Reds. Cincinnati, who designated Legumina for assignment last week when they signed Austin Hays, receives cash considerations in return. The M’s have designated left-hander Jhonathan Díaz for assignment in a corresponding move.

Legumina, 28 in June, has a limited major league track record to this point. He threw a combined 22 innings for the Reds over the past two seasons, allowing 17 earned runs for an unpleasant 6.75 ERA. His 16.7% strikeout rate and 10.2% walk rate in that time have both been below average, though his 56.4% ground ball rate has been strong.

The M’s are probably more interested in his larger sample of minor league work. Over the past four years, he has logged 226 2/3 innings on the farm with a 4.05 ERA, 26% strikeout rate and 8.5% walk rate. He did a decent amount of starting earlier in his career but has primarily been working in relief over the past two seasons.

He still has one option year remaining and less than a full season of service time. That means he can be shuttled between the majors and the minors pretty freely for one more year and can also be cheaply retained well into the future if he continues to hang onto a roster spot. The M’s apparently had enough interest in Legumina as a depth arm that they sent some cash to the Reds in order to skip the waiver line.

Díaz, 28, also has a small big league résumé. He has thrown 45 innings in the majors, scattered across four different seasons. He has a 4.80 ERA, 15% strikeout rate, 12.6% walk rate and 45.7% ground ball rate.

Naturally, the minor league numbers are better, and in a larger sample. Over the past four years, he has thrown 328 innings on the farm, most of that coming in the hitter-friendly Pacific Coast League. He has a 4.42 ERA in that time, along with a 23.6% strikeout rate, 9.4% walk rate and grounders on about half of the balls in play he allowed.

Díaz still has a couple of options and could perhaps appeal to a club looking for some affordable rotation depth. The M’s will have a maximum of one week of DFA limbo to figure out what’s next for the lefty, though the waiver process takes 48 hours, so any trade talks would need to happen in the next five days.