The Diamondbacks are signing Seth Frankoff to a minor-league contract, MLBTR has learned. The 32-year-old made his return to MLB last year after spending the previous two seasons in South Korea.
A former Athletics, Cubs and Dodgers farmhand, Frankoff performed well for the Korea Baseball Organization’s Doosan Bears from 2018-19. Over a combined 266.2 innings between the two seasons, the right-hander posted a 3.68 ERA with solid strikeout (21.9%) and walk (7.6%) rates.
That showing earned Frankoff a minor-league deal from the Padres last winter. He failed to crack San Diego’s big league roster, though, and elected free agency. The Vanguard Sports client then signed a minor-league deal with the Mariners and eventually earned his way onto the roster. He made a pair of relief appearances before being optioned out and was eventually outrighted off Seattle’s 40-man.
Frankoff’s big league track record only consists of three MLB games (one with the 2017 Cubs). Nevertheless, he’ll be on hand as a flexible high-minors depth option for the D-Backs. Frankoff’s starting experience in Korea could make him an option for either the rotation or multi-inning relief if he shows well in the spring.


It was less than four years ago that Rosario was a consensus top-10 prospect in baseball, and between his young age (25) and the flashes he has shown over four MLB seasons, it isn’t out of the question that he can still fulfill that potential with a change of scenery. Rosario looked to be breaking out in 2019, when he hit .322/.353/.453 over his final 372 plate appearances of the season, but he managed just a .252/.272/.371 slash line in 147 PA in 2020.