Kenta Maeda
On March 28, 2015, Johnson made his NPB debut. With Hiroshima in 2015, Johnson started 28 games and put together a 14-7 record with a 1.85 ERA and a 1.09 WHIP. His ERA mark led the Central League and his 14 wins ranked tied for second behind only teammate Kenta Maeda, who signed with the Los Angeles Dodgers after the season.