"I want to thank the Tampa Bay organization for the opportunity and trust they showed in me since Day 1 of becoming a Ray," Smyly wrote. "There's no doubt in my mind I've become a better pitcher since arriving. I will forever be grateful to everyone in the organization that has helped me grow as a player on the field, and a man off the field.
"I loved my time there and was able to receive countless information about myself that I never knew before, and will carry that with me to Seattle. I'm blessed to be a Major League Baseball player and can't wait for the new challenge in Seattle."
The 27-year-old Smyly, who was acquired in the 2014 trade that sent David Price to the Tigers, went 7-12 with a 4.88 ERA in 30 starts for the Rays in 2016, establishing career highs in starts, innings pitched and strikeouts. Over his final 12 starts, he went 5-1 with a 3.73 ERA.
Over parts of three seasons with Tampa Bay, Smyly went 15-15 with a 3.95 ERA and 288 strikeouts in 49 starts.
Bill Chastain is a reporter for MLB.com based in Tampa. Follow him on Twitter at @_wwchastain. This story was not subject to the approval of Major League Baseball or its clubs.