Arsenal maintained their perfect start to the season with a hard-fought 2-0 victory at Sunderland, a result built on a crucial goalkeeping save and a moment of brilliance from substitute Bruno Guimarães against his former club.
Mikel Arteta's side extended their unbeaten run to six matches across all competitions, though they were made to work far harder than in previous outings at a raucous Stadium of Light. Sunderland, organised and physical under Régis Le Bris, gave the champions their sternest examination of the campaign so far.
The first half offered little in the way of clear chances. Bukayo Saka failed to convert after being played through by Declan Rice, while at the other end Dan Ballard headed wide from a Granit Xhaka free-kick. Kai Havertz twice went close for Arsenal, first blazing over and then forcing a smart save from Robin Roefs with an acrobatic effort on the turn. Gabriel Magalhães also tested the Sunderland goalkeeper with a low drive from distance.
Arteta made two changes at the interval, withdrawing an injured Ben White and the struggling Myles Lewis-Skelly for Jurriën Timber and Guimarães. The switch would prove decisive, though not before Sunderland created the game's biggest moment. In the 56th minute, Ezri Konsa was penalised for pulling down Ballard inside the box, and referee John Brooks pointed to the spot. Enzo Le Fée stepped up but saw his effort brilliantly turned onto the post by David Raya, who guessed the right way and denied the Frenchman at a pivotal juncture.
Arsenal made Sunderland pay almost immediately. Just two minutes after Raya's save, Guimarães picked up the ball on the edge of the area and curled a magnificent strike beyond Roefs, the ball crashing in off the underside of the crossbar. It was the Brazilian's first goal since his summer move from Newcastle, and he was jeered by home supporters throughout for his previous ties to Sunderland's fierce rivals — a reception he answered in style.
Sunderland refused to fold and pushed for an equaliser, switching to a 4-4-2 formation and introducing new signing Malick Fofana to add fresh threat. Nordi Mukiele was a persistent menace down the right, forcing Raya into further saves and volleying a corner over the bar when well placed. Timber thought he had headed Arsenal further ahead but the effort was correctly ruled out for offside, while Ballard produced a vital goal-line clearance to keep the hosts in contention.
The contest was settled in stoppage time. Reinildo Mandava, who had done a solid job shackling Saka for large periods, was shown a second yellow card for felling the Arsenal winger inside the box, reducing Sunderland to 10 men. Saka converted the resulting penalty in the seventh minute of added time to make it 2-0 and put the result beyond doubt.
Raya's save was widely regarded as the turning point of the match, with the Spanish goalkeeper excellent throughout as Arsenal weathered Sunderland's pressure. Guimarães, meanwhile, made an immediate impact off the bench in front of a crowd that had booed his every touch.
For Sunderland, there were signs of encouragement despite the defeat, with Le Fée and Mukiele both catching the eye. However, the result leaves them with back-to-back losses in the league, while Arsenal head back to London having passed their toughest test of the season intact.
Based on reporting from Guardian, BBC Sport, Standard, and Independent.