Arsenal won the Community Shield on penalties, with Chelsea's Thibaut Courtois missing in the shootout, following a 1-1 draw in normal time at Wembley.
Chelsea began without Diego Costa, Nemanja Matic and John Terry, and with none of their new signings in the starting XI. Alexandre Lacazette started for Arsenal and hit the post with the best chance of the half, with Sead Kolasinac making a first-half start when he replaced Per Mertesacker, who received an accidental elbow to the face from Gary Cahill.
In the second half, Victor Moses put Chelsea ahead within seconds of the restart with a finish from close range.
With 10 minutes left, Pedro was surprisingly sent off for a hack at Mohamed Elneny, and from the free-kick, Kolasinac could head in unmarked.
Olivier Giroud won it for Arsenal, blasting a penalty down the middle in the new ABBA shootout format, after Alvaro Morata and Courtois missed for Chelsea.
Should Pedro have been sent off? Yes, is the short answer. Pedro's challenge was late, and it went down into Elneny's Achilles after launching himself into the air. It seemed harsh on first look, but there was enough justification looking at the replays.
MAN OF THE MATCH
David Luiz (Chelsea): Few would have expected that Luiz would be Chelsea's new defensive leader, but he has come back from his time in France vastly improved. He was at the heart of Chelsea's defensive solidity, and could be vital to a fresh league and European campaign for his side.
Arsenal's Sead Kolasinac celebrates scoring their first goal
Arsenal players celebrate winning the penalty shootout
Image credit: Reuters
23' - LACAZETTE HITS THE POST - Arsenal break at pace, the ball is worked to Lacazette down the middle, and he curls a ball around Cahill, crashing against the post.
46' - GOAL! Arsenal 0-1 Chelsea. Moses scores - A cross from Willian is flighted in. Arsenal get it to the edge of the box, but struggle to properly clear it. Cahill sends the ball back in towards the goal, and Moses turns it in just in front Cech at the near post.
49' - CECH SAVE - Another chance for Chelsea. A short corner is stood up by Fabregas into the box when he receives a return pass, and Batshuayi's volley is saved by Cech.
Victor Moses of Chelsea celebrates scoring his sides first goal
Image credit: Getty Images
59' - COURTOIS SAVE - Elneny whips in a cross from the right as he tumbles, and it curls back in towards goal, forcing Courtois to tip it over the bar.
80' - RED CARD! Pedro's late challenge catches Elneny on the Achilles. Pedro then goes down with cramp, and is looking set for a booking when he gets back up. But it's a red! Pedro's challenge was late, and he had come down into the Arsenal midfieder, so it's not too shocking.
82' - GOAL! Arsenal 1-1 Chelsea. Kolasinac scores - Xhaka curls in a cross to the back post, and Kolasinac is on hand, unmarked, to nod in at the back post.
PENALTY 7' - GOAL! Chelsea 1-4 Arsenal. Giroud wins it for Arsenal. His penalty, down the middle, makes it impossible for Chelsea to come back from the deficit. Arsenal made the most of their advantage as soon as Pedro lost his composure, and now Arsenal have two wins in a row against Chelsea at Wembley.
Pedro is the first player to receive a straight red card in the Community Shield since Branislav Ivanovic in 2012.