Derby County manager Nigel Clough applauded his team's work ethic after the Rams celebrated their best start to a season for 106 years.
Goals from Kevin Kilbane, Steve Davies and Ben Davies helped Derby earn a 3-0 success over Doncaster Rovers at Pride Park.
It was a fourth Championship victory for Clough's men who condemned Doncaster to their fourth defeat.
The Rams boss said: "It's totally down to the hard work from the players.
"The effort they have put in in the first four league games has been excellent.
"They are going to have to do in the next 42 but it's encouraging when we see the effort that has gone in.
"We are not the silkiest football team at the moment but we are certainly one of the most hard working in the country.
"We probably didn't have the majority of the possession in the game but the quality of the goals and the timing of them was excellent, and we looked after it from there."
Doncaster boss Sean O'Driscoll pulled no punches over his team's display and had no complaints about the result.
Rovers had won their three previous league visits to Pride Park, but any chance of adding to that had been in doubt from the moment Kilbane arrived to head home Ben Davies' sixth-minute corner.
O'Driscoll's team had their share of possession for the rest of the half but, with Billy Sharp and James Hayter both injured, they lacked a cutting edge up front.
O'Driscoll said: "Goals dictate results but we've always concentrated on performances and I thought in the first half we were in second gear and in the second we were in reverse.
"It's disappointing because it's the first time this season we haven't come off the pitch thinking we deserved something.
"But credit to Derby, they worked harder than us and although there was nothing outstanding in the game from either team, they worked harder and if you do that in this division you get your rewards.
"I've said all along that if we can't compete in this division we shouldn't be in it, so whether we have got injuries or we haven't got injuries we have never used that as an excuse and we are not going to start now.
"There are certain aspects of playing football in this division that you need to do and we didn't get anywhere near that."