Sonny Bradley's brace kept Derby on course for automatic promotion as they claimed a 3-0 win over Leyton Orient.
The Rams got the start they needed in the 10th minute when Kane Wilson tapped in at the back post from a Nathaniel Mendez-Laing corner.
It got even better for the home side eight minutes later when a Louie Sibley corner dropped to Bradley and he fired into the roof of the net.
Orient hardly figured as an attacking threat until Ethan Galbraith had a shot blocked at the end of a first half which had been all Derby.
Shaq Forde had a shot deflected over at the start of the second half but Mendez-Laing went close to a third for Derby with a flick that went narrowly over.
Mendez-Laing had a great chance to finish the game in the 61st minute when he raced clear but a heavy touch allowed goalkeeper Sol Brynn to deny him.
But Bradley made no mistake from another corner in the 86th minute with a bullet header at the back post.