Chesterfield manager John Sheridan was left to rue missed chances at the Cherry Red Records Stadium, as his side succumbed to a disappointing 1-0 defeat at the hands of AFC Wimbledon.
The Spireites were welcomed back to life in League Two with a disappointing defeat in soaring temperatures in Kingston-upon-Thames, after completely dominating the opening exchanges.
Wombles striker Jack Midson pounced 10 minutes before the break to punish the League Two newcomers, leaving Chesterfield to make the long journey back up the M1 empty-handed.
"We started the game really well and had some great chances," said Sheridan.
"we could have scored a couple of goals in the first 20 minutes and then it's typical of us, people switching off and their first shot on goal is in the back of the net.
"But second-half, I don't think we did enough. I definitely thought the game was there for the taking, but that's me thinking that. I don't know if the players thought that.
"We gave the ball away cheaply, but at the end of the day they're 80 yards away from our goal. Jordan should do better, but it's a straight ball and people have switched off."
The Spireites were forced to play 120 minutes on Tuesday night, after drawing 0-0 with Tranmere Rovers at the end of normal time.
And typically, the opening day of the football season was greeted with glorious sunshine across the country but Sheridan refused to believe either had an impact after his side started on the front foot.
"No-one's going to tell me the weather was a factor, it was the same for both sides, it was a beautiful day for football whether it was hot or not but it is a very disappointing result," he added.
"I'm not pleased one bit, we can't just play well for 20 minutes. We played well for 20 minutes and created enough chances to win the game. The game was definitely there for the taking and it frustrates me.
"We should have won the game, but we didn't. I'm just repeating myself. I expected us to win that game.
"We've got to take our chances and we haven't. We switched off and it has cost us.
Watch John's interview in full on Spireites Player.