The D'Backs have lost four straight and eight of their last 10, but they've won six of the last eight when hosting the Rockies at Chase Field.

Colorado is just 25-52 on the road on the season and righty Jon Gray (8-12, 4.34 ERA) is 3-7 with a 4.73 ERA in his away starts. Gray is 1-2 with a 4.80 ERA in five 2021 starts against Arizona in 2021 and 5-7 with a 5.17 ERA in 17 career meetings.

Arizona right-hander Humberto Castellanos (2-2, 4.28 ERA) held Colorado to just four hits over four scoreless innings when he faced them back in July.

8* play on Arizona Diamondbacks.