The struggling Arizona Diamondbacks fired hitting coach Darnell Coles and assistant hitting coach Eric Hinske on Thursday.
Triple-A hitting coach Rick Short and run production coordinator Drew Hedman were promoted to co-hitting coaches.
Arizona, currently in last place in the National League West with a 20-43 record, have lost seven straight games and 19 in a row on the road. Their road slide is the longest such streak in Major League Baseball since 1985.
The Diamondbacks are currently third-to-last in the National League with a .231 batting average and fourth-to-last in OPS at .685.
The Associated Press contributed to this report.