Oldham 5-2 Chesterfield
Robbie Simpson scored a 21-minute hat-trick as Oldham crushed Chesterfield.
The hosts were ahead in three minutes as Kieran Lee slammed his shot into the bottom corner from 25 yards.
A fine run by Paul Black set-up Simpson for his first from 10 yards and the striker, netted his second from a free-kick.
Craig Westcarr's header closed the gap, Simpson completed his treble from close range and then set-up Shefki Kuqi, while Leon Clarke netted a consolation.
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Oldham Athletic manager Paul Dickov told BBC Radio Manchester:
"I thought for the majority of the game some of the football we played was as good as we've played since I've been at the club.
"Robbie (Simpson) is a top footballer, a clever footballer and technically he is one of the best at the club.
"I thought all over the pitch today we were excellent."
Chesterfield manager John Sheridan told BBC Radio Sheffield:
"Very poor, I'll be embarrassed to watch that again. Embarrassed for the supporters that have come to support us.
"I've got to question the players that are going out on the pitch. I've got to question me, if I'm picking the right team.
"We're conceding very, very soft goals and too many soft goals."