[1] He was not drafted out of high school and attended Louisiana State University (LSU), where he played college baseball for the Tigers.

[2] As a freshman at LSU in 2015, Deichmann played in only ten games due to a foot injury and had eight hitless at-bats.

[7] Against Hofstra that season, he hit a home run out of Alex Box Stadium that traveled an estimated 486 feet.

[11][12] He signed with Oakland and was assigned to the Low-A Vermont Lake Monsters where he batted .274 with eight home runs and thirty RBIs in 46 games.

[13] In 2018, he was assigned to the High-A Stockton Ports but dealt with various hand injuries and played in only 47 games, hitting .199 with six home runs and 21 RBIs.

[24] He played in 78 games for the Triple-A Iowa Cubs, slashing .214/.271/.335 with 7 home runs, 33 RBI, and 8 stolen bases.

[26] He played in 108 games split between the Double–A Midland RockHounds and Triple–A Las Vegas Aviators, compiling a .245/.324/.467 batting line with 19 home runs, 61 RBI, and 16 stolen bases.