AFC Wimbledon opened their League Two campaign with a victory over relegated Chesterfield, thanks to a first-half goal from Jack Midson.
The Dons' joint-top goalscorer last season swept home after collecting Angus MacDonald's lofted through ball.
Chesterfield's Drew Talbot found Seb Brown equal to his stinging drives, before Warren Cummings cleared Jordan Bowery's effort off the line.
Brown then had to be at his best to deny Sam Togwell as the Dons held on.
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AFC Wimbledon manager Terry Brown tells BBC London 94.9:
"I can't get the smile off my face, we've had one of the most dismal pre-seasons I can remember having.
"Going into this game we hadn't won in about four or five and this was a game we needed to get our noses in front.
"We got battered for about half an hour, they run us ragged, but we nicked a goal after about 35 minutes and then the game changed.
"They had to chase the game in the second half but, as the game went on, we looked dangerous."
Chesterfield manager John Sheridan tells BBC Radio Sheffield:
"We should have scored four goals in the first 15-20 minutes.
"We played really, really well and opened them up for fun, but we just didn't take our chances.
"Then with their first attempt they go and score, so it gives them something to hold onto.
"We definitely should have worked harder to get something out of the game."
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AFC Wimbledon 01 Brown 03 Cummings 04 Harris 05 Balkestein Booked 06 Mitchell-King 16 MacDonald 07 Long (Yussuff - 78' ) 08 S Moore 18 Kiernan (Jolley - 66' ) 10 Midson 11 L Moore Substitutes 33 Jaimez-Ruiz 15 Fenlon 12 Jolley 20 Merrifield 23 Yussuff 09 Harrison 21 Strutton Chesterfield 01 Lee 03 Smith 04 Forbes 05 Trotman (Westcarr - 68' Booked ) 06 Hird 08 Togwell Booked 10 Whitaker 23 Randall 25 Talbot 09 Richards (Lester - 80' ) 21 Bowery (Boden - 61' ) Substitutes 13 O'Donnell 12 Darwikwa 07 Allott 11 Westcarr 14 Lester 18 Boden 19 Hazell