Stephen Robinson hailed his side's effort as Oldham overcame 10-man Wigan 2-1 to make it through to the second round of the EFL Cup.
Josh Law got the match-winner for the League One side after 83 minutes when coolly slotting home from a Ryan Flynn pass.
Flynn had earlier given Oldham the lead before it was cancelled out by Will Grigg, and the home side made the most of their numerical advantage after the Championship team had Jake Buxton sent off just before half-time for a high challenge on Marc Klok.
It was the perfect response from Oldham after their opening-day 3-0 defeat at Millwall and Latics boss Robinson said: "It was a good win and we thoroughly deserved it as well.
"I asked the boys to give us a performance and a work ethic and desire and they showed that in abundance.
"I will say it again -- it wasn't the end of the world losing to Millwall. We have brought in 16 players in four weeks.
"I know where we are as a team. Financially, it is a great result for the club as well against a very good Wigan side but we are very much at the start of what we are trying to do.
"Peter Clarke was fantastic for us at the back and he helped Cameron Burgess, who made a mistake at Millwall.
"Paul Green is another fantastic player for us and those are your captains on the pitch, who take on the ideas you work on in training.
"It is the standard we have set now and that has to remain."
Wigan boss Gary Caldwell insisted he was pleased with the way his team went about their business despite losing to lower-league opposition.
"We cannot afford to give goals away like that and win games," he said. "But overall, the way we passed the ball and the energy we showed, even with 10 men, I was delighted with.
"It was important that players got a game here after having their pre-season.
"We needed them to get a game and to rest others with Saturday in mind. Overall, that was good that I managed to do that.
"We don't want to lose any game. We want to win, so we are hurting. But we also know that if we keep on performing at that level and cut out the silly mistakes, then we will start winning games very quickly.
"We still know that we need to add strength to the squad. We had a lot of academy players coming on here and need to add more strength in depth."