Carabao Cup first round
Oldham Athletic 0 Derby County 2
DERBY County put aside their weekend woes and booked a place in the Carabao Cup second round after a comfortable victory at Oldham Athletic.
Frank Lampard's men were hammered 4-1 by Leeds United on Saturday in the manager's first home game since taking charge in the summer.
And this match, against a side two divisions below them, was a potential banana skin, such is the nature of domestic cup competitions.
But Derby bounced back from their weekend hammering, with Lampard making wholesale changes to his team.
They scored in each half, through a Sam Graham own goal and a stunning effort from Mason Mount in the second 45 minutes.
The Joe Royle Stand was officially opened by the man himself prior to the game, with Oldham's most successful manager declaring: "If you don't dream it, it can't happen".
But the League Two side had a nightmare ahead of the game, as they were decimated by injuries, meaning manager Frankie Bunn could name only six substitutes.
Derby, who gave debuts to Jack Marriott, Scott Malone, Jaryd Bogle and George Evans, looked dangerous from the off.
Marriott, a £5 million summer signing from Peterborough United, nearly made an instant impact.
Bradley Johnson found Malone on the left and the former Huddersfield Town full-back whipped the ball into the box, only for Marriott to head it over the crossbar.
Florian Jozefzoon, making his first start for the Rams, was a constant menace on the left wing.
And the Dutchman nearly gave Derby the lead in the 18th minute, but found his well-taken shot was blocked in the area by Oldham centre-half Sam Graham.
Then Evans' cross found Jozefzoon, but he headed the ball wide.
Oldham's first chance came in the 25th minute when Rob Hunt crossed for Chris O'Grady, only for Derby goalkeeper Scott Carson to collect the striker's effort with ease.
At the other end, Oldham goalkeeper Daniel Iversen made two super stops.
Firstly, he made a fingertip save to deny Marriott and then the Dane, on-loan from Leicester City, caught Johnson's ball after the Derby midfielder was teed up by Malone.
The visitors took the lead in the 34th minute.
Bogle was brought down just outside the area by George Edmundson, which led to Harry Wilson's free-kick being diverted past his own goalkeeper by Graham.
Oldham twice went close, through Jonathan Benteke, as the clock ticked down to half-time, but they could not find the leveller.
Mount was the best player on the park and created numerous opportunities for his team-mates.
And the young midfielder took all the plaudits when he scored Derby's second goal with a sumptuous strike in the 70th minute.
Evans' mis-hit shot fell into Mount's path and he fired the ball from the edge of the box with a thunderbolt which gave Iversen no chance.
Oldham should have pulled a goal back two minutes later when Johan Branger-Engone launched a swerving shot, but it was brilliantly saved by Derby goalkeeper Scott Carson, who tipped the ball around the post.
Mount was at the heart of the action again when his free-kick was whipped into the box, but was diverted over the bar by Iversen.
Oldham had another opportunity to pull a goal back when Tom Hamer's long throw found Jose Baxter, but the substitute's volley crashed against the woodwork.
Derby had the ball in the net for a third time six minutes from full-time, thanks to Jozefzoon, but referee Darren Bond deemed Oldham defender Rob Hunt had been fouled in the build up.
Lampard said it was a comfortable win.
He added: "You can only beat what is in front of you, but it was a complete performance and we have a big squad which gives us options throughout the season."
Bunn said he had taken positives from his team's performance.
He explained: "Derby had the extra class in certain areas of the field and it was difficult for us with the quality of their set plays, which you don't encounter much in League Two.
"We were just lacking that bit of quality in the final third, but I don't think we looked out of place against a good Championship team."
Oldham Athletic: Iversen; Hunt, Edmundson, Graham, Hamer; Coke (Missilou, 76), Gardner, Nepomuceno; Branger-Engone; Benteke (Baxter, 57); O'Grady.
Substitutes not used: De La Paz, Stott, Sheridan and Maouche.
Derby County: Carson; Bogle, Keogh, Tomori, Malone; Johnson (Bird, 76), Mount, Evans, Jozefzoon; Wilson (Bennett, 65); Marriott (Waghorn, 80).
Substitutes not used: Roos, Forsyth, Pearce and Lawrence.