As a member of the USA Baseball Collegiate National Team following his sophomore year, Jefferies was a member of the Wareham Gatemen of the Cape Cod Baseball League.
The Oakland Athletics selected Jefferies with the 37th pick in the 2016 MLB draft.
First professional season: AZL Athletics, 2.38 ERA, 17 strikeouts, 11.1 innings threw him in. Before Tommy John surgery, he appeared in only two games for the Stockton Ports in 2017.
As part of his rehabilitation to get healthy again, he played in one AZL game in 2018. Over 79 innings, Jefferies was 2–2 with a 3.41 ERA for the Stockton Raiders and Midland RockHounds in 2019.
After the 2019 season, Jefferies was added to the Athletics’ 40-man roster as a free agent. Jefferies was added to the roster to face the Texas Rangers in a back-to-back set on September 12, 2020.
After two innings, Jefferies gave up five runs on two home runs and took the loss in his major league debut.
Jefferies can perform on four different pitches. In the low to mid 90s, his fastball has a little sink and can reach 96 mph.
His changeup, which he throws in the mid-80s with good sink and drift, is his major off-speed pitch. With a solid slider and a solid three-quarters curve, he also throws well.
Does Daulton Jefferies Have Any Kids?
Daulton Jefferies doesn’t have any kids.