Derby County were left stunned as a second-half defensive masterclass by Grimsby Town condoned Paul Clement to defeat in his first ever game as head coach.
In the first half, Grimsby were able to take advantage of a defensively disjointed Derby side by scoring two goals in quick succession. A much-improved Rams put the Mariners under a lot of pressure in the second half but, at full-time, only had a wonderful goal from Johnny Russell to show for their efforts.
Derby County player ratings
First-half: Lee Grant - 5; Stephen Warnock - 5, Richard Keogh - 6, Ryan Shotton - 4, Cyrus Christie - 5; Jamie Hanson - 4, George Thorne - 4, Will Hughes - 5; Tom Ince - 6, Ivan Calero - 7, Darren Bent - 5.
Second-half: Scott Carson - 6; Craig Forsyth - 6, Raul Albentosa - 8, Alex Pearce - 6, Isak Ssewankambo - 7; Chris Baird - 7, Craig Bryson - 6, Jeff Hendrick - 7; Johnny Russell - 7, Conor Sammon - 7, Andreas Weimann - 6
The first-half performance mirrored the last three months of last season as Derby's defensive frailties and laboured passing allowed Grimsby to take a 2-0 lead.
The central defensive partnership of Shotton and Keogh looked unbalanced, the whole midfield was guilty of giving the ball away too cheaply and the service to Bent was non-existent. Calero, who was the best player on the park for the first 45, and Ince worked tirelessly, but saw their efforts come to nothing.
The second half was very much an improved display, with Sammon playing a key role in Derby's attacking build-up play. Debutant Ssewankambo was an ever-present threat down the right-hand side of the pitch as Albentosa and Pearce comfortably kept Grimsby out.
Baird, who recently signed from West Bromwich Albion on a free transfer, was very good in the holding midfield role and allowed Bryson and Hendrick to join in with the attack.
Weimann worked hard and showed glimpses of his quality but failed to make a real impact on the game, while Carson was barely troubled.