Oldham Athletic came away from the SMH Group Stadium with all three points after a fully deserved 3-0 win.
To rub salt in the wounds, the goals came from two former Chesterfield players in Kane Drummond, who bagged a brace, and Mike Fondop.
"We didn’t have any answers,” Paul Cook said afterwards. “We didn’t have any outlets. We lacked physically at the top end of the pitch. The players struggled for confidence on the pitch and that is not a good vibe from us. Well done to Oldham but wow, we were a million miles off it.”
The result meant Chesterfield dropped out of the play-offs down to eighth, while the Latics climbed to 11th.
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