Manchester City threw down an early marker in the Premier League title race by beating rivals Manchester United 2-1 on Saturday.
Kevin de Bruyne and Kelechi Iheanacho scored at Old Trafford as City maintained their 100 percent start to the season with a fourth straight league win.
"It feels very good," de Bruyne told Sky Sports."Very hard game, very intensive.
"I think both teams showed their quality. "It was a fight until the end and we are very happy."
While City stayed perfect a trio of teams - Watford, Crystal Palace and Bournemouth - picked up their first victories.
Watford came from behind to win 4-2 at West Ham, Palace beat Middlesbrough 2-1 and Bournemouth edged West Brom 1-0.
Much of the pre-match focus before the Manchester derby was on the managers and once again City's Pep Guardiola topped United's Jose Mourinho.
“First half we were better, in the second half it was difficult,” Guardiola, who has lost just three of 17 games against Mourinho, told the BBC.
"But we go to one of the best stadiums in the world and win the game."
De Bruyne and Iheanacho scored in the first 35 minutes as City dominated.
United were then thrown a lifeline before half-time by new City keeper Claudio Bravo, making his debut after signed this summer to replace Joe Hart.
Bravo failed to catch a free-kick in the area and the ball fell to Zlatan Ibrahimovic, who blasted it into the back of the net.
United had a goal disallowed in the second half for offside and de Bruyne would hit hit the post again.
"In the first half we were below the level to play this match," Mourinho said.
"You have to be completely ready in terms of the speed of your thinking and decision making.
"We paid for our mistakes."
Watford staged a fierce comeback to shock West Ham, who led 2-0 through Michail Antonio.
Odion Ighalo and Troy Deeney pulled Watford level by half-time and Etienne Capoue and Jose Holebas struck after the break to cap the comeback.
Christian Benteke and Wilfried Zaha scored as Crystal Palace handed Middlesbrough their first loss while Callum Wilson's 79th-minute goal lifted Bournemouth past West Brom.
Santi Cazorla's 94th-minute penalty gave Arsenal a 2-1 win over Southampton. The kick came after Jose Fonte was judged to have fouled Olivier Giroud.
Son Heung Min scored twice as Tottenham thrashed Stoke 4-0 and Robert Snodgrass's 95th-minute free-kick gave Hull a 1-1 draw at Burnley.
Champions Leicester City visit Liverpool in Saturday's final match.