Town did themselves proud but were ultimately outclassed by superior opposition. Check out our player ratings to find out who impressed at Pride Park...
9. Sam Hoskins
Cobblers' biggest threat on the night, forcing home 'keeper Roos into his only two saves and having a third effort blocked on the line. Another well-taken penalty took him to double figures for the season... 8 CHRON STAR MAN | Getty Photo: Pete Norton
10. Andy Williams
Won the late penalty but it had been a tale of woe before that as the Rams had his card marked and much of his night was spent chasing lost causes... 6.5 | Getty
11. Vadaine Oliver
Hooked at half-time after a first-half in which he struggled to impose himself and was comfortably contained by Derby's centre-backs... 6 | Getty
12. Matty Warburton
Made a positive impact off the bench, providing more of a link between midfield and attack for the visitors... 6.5 | Getty