Player ratings: Ozil's soft display hampers Arsenal at Chelsea
Arsenal manager Arsene Wenger might have bested Jose Mourinho in their scuffle on the touchline, but it was the Portuguese manager who took all three points at Stamford Bridge. Chelsea remain unbeaten in the league, and Mourinho remains unbeaten against his French counterpart.
The game itself was actually pretty tight. Arsenal set up more cagily than in 2013-14, and their conservative approach kept them in the contest for long spells. However, the Gunners struggled to create clear-cut chances.
Ultimately, the game was decided by moments of magic from Eden Hazard and Cesc Fabregas. Arsenal's key creative players were disappointing by comparison, with Mesut Ozil's performance particularly poor.
Player Ratings (1-10; 10=best. Players introduced after 70 minutes get no rating)
Wojciech Szczesny, 6 - Szczesny wasn't called on to make many great saves, as Chelsea mustered only three shots on target. The Polish stopper had no chance with Hazard's superb penalty. On the second goal, his charge from his line was somewhat hesitant; perhaps he was briefly haunted by his midweek sending off against Galatasaray.
Calum Chambers, 7 - Although lucky to escape a second yellow card late in the first half, Chambers recovered to give an assured display at right back. The youngster will be missed against Hull, having picked up a suspension for receiving five bookings.
Per Mertesacker, 6 - Mertesacker will be disappointed that the back four under his command was beaten so easily for Chelsea's second goal. It was a superb pass from Fabregas, but Diego Costa's straightforward run appeared to catch out the Arsenal defence.
Laurent Koscielny, 5 - Koscielny tripped Hazard to concede the penalty that gave Chelsea the lead. Given that Koscielny appeared to deny the Belgian a clear goal-scoring opportunity, the Frenchman was arguably a little fortunate to stay on the field.
Kieran Gibbs, 7 - Another solid display from Gibbs. In this fixture last season, Andre Schurrle scored one goal and created another inside the first seven minutes. This time round, Gibbs kept the German international quiet.
Mathieu Flamini, 7 - Flamini has recovered from his error against Tottenham to produce two good performances within a week. He battled well to keep Chelsea's midfield at bay, flying into challenges with commitment and courage.
Jack Wilshere, 6 - For a long period of the match, Wilshere looked like the man most likely to help Arsenal achieve a breakthrough. However, he struggled to find the crucial final ball to match his industry. Wilshere had Arsenal's best chance of the game, but a heavy touch allowed the ball to run through to Chelsea goalkeeper Petr Cech.
Santi Cazorla, 6 - Surprisingly, Cazorla was stationed in the same deep central role he occupied against Galatasaray. He coped well, showcasing nimble footwork to navigate through the congested midfield. The Spaniard was obviously disappointed to be substituted with 20 minutes to go.
Alexis Sanchez, 7 - Even in a somewhat pedestrian Arsenal performance, Sanchez was a live wire. For all his effort, his intricate dribbling couldn't find a way through the impenetrable Chelsea defence.
Mesut Ozil, 4 - It's difficult to understand just how Ozil managed to avoid being substituted against Chelsea. Deployed on the right flank, he was woeful. Not only was his passing shockingly erratic, but he seemed to shrink in the face of Chelsea's physical approach. He must toughen up if he is to influence these big games.
Danny Welbeck, 5 - Welbeck struggled to get involved in the game. Chelsea defended deep, preventing him from running in behind. His frustration began to show late. As much as it may have endeared him to the Arsenal fans, his late lunge at Fabregas was dangerous and unnecessary.
Alex Oxlade-Chamberlain, 5 - The England midfielder was unlucky not to start, but he failed to make an impact after replacing Santi Cazorla (69).
Tomas Rosicky, NR - Rosicky came on with the scoreline already at 2-0 to give Jack Wilshere's legs a rest (83).
Lukas Podolski, NR - Podolski was brought on for Sanchez in a bizarre late switch (79). Made a good run to meet an Ozil pass but was smothered by Cech.
James McNicholas is one of ESPN FC's Arsenal bloggers. You can follow him on Twitter @gunnerblog.