London:Sven-Goran Eriksson won his second in as many games at Manchester City on Wednesday while neighbor United had Cristiano Ronaldo sent off for an apparent headbutt in a 1-1 draw at Portsmouth.
Chelsea rallied to win 2-1 at Reading to also move into a tie at the top of the English Premier League.
Former England coach Eriksson guided Man City to a 1-0 victory over promoted Derby, four days after opening with a 2-0 victory at West Ham.
Michael Johnson, a 19-year product of the youth team, scored with a curling shot for the only goal of the game two minutes before halftime for City's first Premier League goal at home in 780 minutes of play.
"It's a long way to go yet. We have to keep out feet on the ground," Eriksson said. "Six points after two games, two clean sheets, it's very good. It couldn't be better and I'm quite sure that in the future we'll play better football as well."
The two victories give City six points and tied it atop the table with Chelsea and Everton. Everton won 3-1 at Tottenham on Tuesday and - although tied on goal difference - leads by having scored more goals. Chelsea trails the lead pair on goal difference.
Chelsea fell behind against Reading when goalkeeper Petr Cech missed an attempted punch, and Andre Bikey capitalised for the Royals in the 30th minute.
But Frank Lampard and Didier Drogba rallied the Blues with two goals in three minutes early in the second half. Reading finished with 10 men after Kalifa Cisse was ejected midway through the second half with his second yellow card.
Manchester United looked in control at Fratton Park when Paul Scholes scored his first goal in 13 games in the 15th minute after a layoff by Carlos Tevez, who was making his debut.
But Benjani Mwaruwari's 53rd-minute header equalized for Pompey and the game flared up near the end. After Sulley Muntari was sent off for his second yellow card, he was soon followed by Ronaldo for what appeared to be a headbutt on Pompey's Richard Hughes.
"My take is that he was provoked. He's fallen into the trap and he's paid the penalty for it," United manager Alex Ferguson said.
"He was surprised at the decision. But (referee) Steve Bennett has sent him off before, and I think he took great delight in sending him off too. So it was a missed opportunity of staying on the pitch and winning the game against 10 men."
In Wednesday's other games, Birmingham and Sunderland drew 2-2, Fulham edged Bolton 2-1 and Wigan won 1-0 over Middlesbrough.