Eichhorn, a 6-foot-1, 220-pound right-hander from Georgia Southern, posted a 3.15 ERA in 14 starts as a junior. The 20-year-old struck out 106 batters over 88 2/3 innings en route to First-Team All-Sun Belt honors.
DeGroat missed the 2018 season as a junior for Liberty University after undergoing Tommy John surgery earlier in the year. However, the 6-foot-2, 195-pound right-hander was named a Cape Cod League All-Star in 2017.
Marman, 21, went 4-0 with a 1.45 ERA in 31 innings for Florida Atlantic this season. The 6-foot-3 righty's season was cut short due to an elbow injury.
Smith, a 21-year-old infielder from Western Michigan University, earned 2018 First-Team honors in the Mid-American Conference. The 5-foot-10, 180-pound Smith was the first MAC Freshman Position Player of the Year in the history of Western Michigan's baseball program.
The Indians have signed seven of their top 10 picks, not including first-rounder Noah Naylor (No. 29), Ethan Hankins (No. 35) and Lenny Torres (No. 41). Naylor, a Canadian catcher from St. Joan of Arc Catholic Secondary School, is the brother of Padres first-base prospect Josh Naylor, while Hankins (Forsyth Central High School, Ga.) and Torres (Beacon High School, N.Y.) are both right-handed pitching prospects.
Casey Harrison is a reporter for MLB.com based in Cleveland.