Romelu Lukaku described his second Chelsea debut as "dominant" after scoring his first Premier League goal for the Blues as the European champions outclassed Arsenal 2-0 on Sunday.

The Belgian has returned to Stamford Bridge for a club record $132 million as the missing piece of a proven goalscorer to turn the Champions League winners into English champions.

Thomas Tuchel's men have made a formidable start towards that aim with six points, five goals scored and none conceded from their opening two games of the Premier League season.

Arsenal, by contrast, have yet to register a point or score a goal as the gulf between Mikel Arteta's men and the title contenders was exposed.

"I would say, dominant," said Lukaku on his performance. "We knew this was a big, big game for us; everybody was watching us, and we did well. As an individual, I tried to help the team. I said that I wanted to add something different to the team, hopefully I did, and I want to keep doing that."

At Molineux, Harry Kane made his first appearance for Tottenham this season in a 1-0 victory against the Wolves. The England captain, frustrated by Spurs' 13-year trophy drought, hopes to force a move to Premier League champions City before the August 31 transfer deadline.

Tottenham were already leading through Dele Alli's 10th-minute penalty by the time Kane arrived on the scene. Alli was fouled by Wolves keeper Jose Sa and the midfielder picked himself up to notch his first league goal since March 2020.

At St Mary's, Manchester United failed to build on last weekend's 5-1 demolition of Leeds as Mason Greenwood salvaged a 1-1 draw at Southampton.

While Ole Gunnar Solskjaer's side left the south-coast frustrated, they did equal Arsenal's English top-flight record of 27 successive away league games without defeat.

In Italy, Cristiano Ronaldo was denied a last-gasp winner to save Juventus after his stoppage-time header was ruled out for offside in a dramatic 2-2 draw at Udinese, while Jose Mourinho got off to a winning start at Roma with a 3-1 victory over Fiorentina.

Ronaldo started on the bench at the Dacia Arena in Udine amid rumours he is looking for a way out of the Italian giants, but he almost snatched the three points deep into stoppage time after Juve insisted he was going nowhere this term.

After the match returning coach Massimiliano Allegri played down the controversy, saying that he was always planning to bring on Ronaldo.

"Cristiano is OK... It's the start of the season and seeing the condition everyone is in and thinking about the game, especially at the beginning, I put him on the bench knowing that there would be a need for him to come on," he told broadcaster DAZN. 

It was the most dramatic moment in an eventful night in the Italian top flight, with six red cards in four matches and three big-name managers returning to the touchline.

The one with the biggest reputation, Mourinho, was made happy by two assists from new signing Tammy Abraham who shone on his Roma debut at the Stadio Olimpico.

Luciano Spalletti also triumphed on his return to football with Napoli, his team running out 2-0 winners over promoted Venezia despite playing three-quarters of the match a man down after striker Victor Osimhen was sent off for punching Daan Heymans.

In Spain, Gareth Bale scored his first Liga goal since 2019 but took two late goals from his replacement, Vinicius, to earn Real Madrid a 3-3 draw at Levante. That result allowed champions Atletico Madrid, who beat Elche 1-0 earlier in the evening, to take the top spot in La Liga. 

It was Bale's first goal in La Liga since his second goal, an 86th-minute equalizer, in a 2-2 draw against Villarreal at the start of September in 2019, a match which he ended by collecting a red card.

"Vinicius has qualities, he's very fast, he's young, he's a great striker," said Ancelotti, but he refused to say if he would start the next game, which could cost Bale his place. "I don't give so much importance to who starts the game or not. It's not that important. Today, Vinicius changed the match with his freshness."

"What we lacked  was in the defense, not in attack," said Ancelotti saying his team needed to work on their "defensive commitment."  

Meanwhile, Atletico, who won the title in a season played behind closed doors, finally got to share their trophy with their fans. For the first time in 18 months, there was a crowd at the Wanda Metropolitano on Sunday, where 24,926 were allowed in.

The home club also presented summer signing Rodrigo de Paul. 

In Germany, Serge Gnabry struck twice as Bayern Munich picked up their first Bundesliga win this season with a 3-2 victory over Cologne.

Rapid-fire goals by Robert Lewandowski and Gnabry put Bayern 2-0 up just after the break, but Cologne roared back with two goals in as many minutes by Anthony Modeste and Mark Uth.

Gnabry gave Julian Nagelsmann his first Bundesliga win as Bayern head coach by smashing the winner into the roof 19 minutes before the whistle.

Lewandowski, who scored a record 41 goals in the Bundesliga last season, has already scored twice in as many league games in 2020/21.

He has now scored in 12 consecutive Bundesliga games dating back to last season. Only Bayern legend Gerd Mueller, who died last Sunday aged 75, bettered the tally by netting in 16 straight league games.