Maybe it shouldn't have been so shocking that the side capable of halting Arsenal's title charge would be led by their former skipper, their former captain. The substitute Brobbey scored an injury-time equaliser after second-half goals from Bukayo Saka and Trossard had given Arsenal ahead following a first-half goal from Sunderland skipper Dan Ballard.
Proved to be a difficult match for the Premier League pace-setters, but Arsenal have a seven point advantage over Manchester City, who are at home the Reds on Sunday, and Sunderland, though Chelsea could reduce the gap to six in the weekend's evening fixture.
Xhaka – who departed the Arsenal's home in 2023 seeking what he called a fresh opportunity – has been exceptional in the promoted side's midfield this season after signing from the German club, but the 33-year-old's form on Wearside will not have surprised Arsenal fans. The Swiss international revived his Gunners stint under Mikel Arteta, who was reluctant to see him leave.
The Black Cats went into the game with nothing to lose after achieving the best start to a top-flight campaign by a promoted side over 10 games since Hull City in the 2008-09 season. A deflected strike from the midfielder against Everton on earlier in the week had boosted them up to fourth place, a standing not many home supporters would have predicted before a ball was kicked given that their side had spent almost a decade away from the Premier League.
The player's expertise, largely gained during his seven years at Arsenal, and captaincy have helped the team quickly adjust to top-tier football. He seemed to revel in the physicality of the encounter.
The Arsenal manager, again without Jesus, Ødegaard, Havertz, Madueke, Gyökeres and Gabriel Martinelli, had an early concern when Merino, playing up front after scoring a brace in midweek's 3-0 European win at Slavia Prague, was caught by an arm from Ballard as he attacked a ball into the home box. The forward was fit to continue.
Eberechi Eze nearly cashed in of an error from Enzo Le Fée, who lost the ball on the border of the penalty area, but the shot flew over the bar.
Wilson Isidor fired off target at the opposite side before a further lengthy stoppage after a head collision between the midfielder and Timber, who had to continue with a head bandage.
A more painful blow was to follow for stunned Arsenal. The home team sent a set-piece into the Arsenal box and Ballard held off Rice to drive the ball past Raya after it was cleared. It was the first goal they had let in since their previous trip to the North East in late September, when they had demonstrated their championship potential with a last-gasp win over Newcastle.
The Gunners had maintained a team best eight successive shutouts in all competitions since Nick Woltemade's goal against them at Newcastle's ground.
Sunderland made sure that it was a further difficult visit to the region for Arsenal, who were under pressure for periods after the interval.
They needed a moment of class, and it came in the 54th minute. The midfielder won possession off his opponent and a smooth attack featuring Eze and the striker culminated in the forward beating Robin Roefs at his near post.
Arsenal pressed for a second goal and Le Bris made a triple substitution to his offense – he brought on Brobbey, Chemsdine Talbi and Adingra – midway through the final period.
Another moment of quality was not far away. They moved the ball from right to left, and the Belgian, on the edge of the box, created enough space to fire a right-footed shot into the top corner.
The keeper had to be alert in the last 10 minutes as Sunderland pressed for a second goal, but was unable to prevent an spectacular shot from Brobbey after the ball was nodded into the box. The goal was met by a huge roar.
Fittingly the defender – similar to his teammate a former Arsenal player, this one developed in the youth system – had the last word with a flying block at the feet of Merino in the match's last action.
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