The Rays designated Diaz for assignment in July after he struggled to a 5.70 ERA and 1.57 WHIP in 31 appearances. Diaz was able to salvage something from 2017 after signing with the Astros, posting a 2.92 ERA and three saves in 12 appearances with Triple-A Fresno to close the year. He also had a couple serviceable seasons with the Reds, so it's not much of a stretch to think he could break camp in the Miami bullpen.

Diaz became a free agent July 21 after being designated for assignment by the Rays, and his MLB experience apparently created some intrigue in the Houston front office. He'll report to Triple-A Fresno at first, although he could find his way to the majors to provide bullpen depth if his performance with the Grizzlies warrants it.

Diaz holds a 5.70 ERA with 28 strikeouts and 15 walks in 30 innings with the Rays this year, but he may soon find a club that needs mopup work. After all, the 33-year-old has useful seasons in 2014 and 2016 to his name.

The 33-year-old has struggled through 30 appearances this season, amassing a 5.46 ERA across 29.2 innings of work. Sunday's move comes on the heels of Diaz throwing just eight pitches earlier in the day against the Angels. He entered in the eighth inning and gave up a hit, putting a runner on that would subsequently score on a two-run homer by C.J. Cron off of Adam Kolarek, who relieved Diaz midway through the eighth. In a corresponding move, the Rays selected the contract of right-hander Andrew Kittredge from Triple-A Durham.