Football can pivot on a single heartbeat, and at the Stadium of Light it did so twice inside two minutes. Sunderland had a penalty to break the deadlock, then the ball, then the crowd behind them. Then they had none of it. David Raya guessed right, Bruno Guimar\u00e3es swung a boot, and a match that could have tilted north-east instead swung emphatically the other way.

By the final whistle Arsenal had turned a tight, tense afternoon into a 2-0 victory that flattered them not one bit. This was a champion-elect's kind of win: patient when it needed to be, ruthless when the door cracked open, unbothered when the noise rose. Sunderland threw everything they had at the visitors and came away with nothing to show but their bruises.

Four games, four wins, twelve points and a single goal conceded all season \u2013 Arsenal's start reads like a statement of intent inked in bold. Mikel Arteta's side left Wearside top of the Premier League and looking every inch the team the rest must chase. For Sunderland, the afternoon offered proof of both their spirit and the cruel margins that separate the promising from the proven.

The turning point

The decisive sequence arrived just before the hour. Sunderland won their penalty and handed the ball to Enzo Le F\u00e9e, the moment the home crowd had been willing into existence. He struck it low and right, aiming for the corner, but Raya had read the script. The Arsenal goalkeeper flung himself to his bottom right and pushed the shot away, and the Stadium of Light's roar died in its throat.

What happened next was the difference between a good side and a great one. Barely two minutes later, Declan Rice slid the ball to Bruno Guimar\u00e3es on the edge of the area, and the Brazilian did not hesitate. His right-footed shot from outside the box arced beyond the reach of everyone and nestled in the top-right corner, a finish of real quality that punished Sunderland for daring to dream.

From a penalty saved to a goal conceded in the space of 120 seconds \u2013 it was a gut-punch few teams recover from. Sunderland's momentum, so carefully built, evaporated in an instant. Arsenal, meanwhile, settled into the comfort of a lead they rarely looked like surrendering, content to let the hosts chase shadows.

Sunderland's frustration

For Sunderland, this was a day that will sting long after the tape has been packed away. They had done the hard part \u2013 they had earned their spot-kick, they had the crowd at full volume, they had Arsenal on the back foot for a rare spell. And they had nothing to show for it. Le F\u00e9e's miss will haunt the highlights, but the truth is Arsenal's response was the greater cruelty.

The afternoon curdled further deep into stoppage time. Reinildo Mandava, already booked, caught out with a second yellow for a bad foul in the 96th minute, leaving his side down to ten men and their resistance in tatters. It was the kind of lapse that speaks to a team stretched thin, chasing a game that had already slipped from their grasp.

Sunderland sit 14th on four points, a return of one win, one draw and two defeats that flatters neither their effort nor their ambition. Three goals scored, five conceded \u2013 the ledger of a side still finding its feet at this level. There is fight in this group, and there were passages here that suggested better days ahead, but the Premier League does not reward valiant near-misses. It rewards the finishing touch, and that is precisely what deserted them.

Ruthless to the last

Arsenal are not a team that eases off, and the final act underlined it. With Sunderland reduced to ten and the clock deep in the red, the visitors were awarded a penalty of their own. Up stepped Bukayo Saka, cool as anyone in the ground, and rolled his left-footed effort into the bottom-right corner in the 97th minute. Two-nil, and the scoreline finally matched the flow of the contest.

It was a fitting flourish from a side that has made a habit of the emphatic. Saka's penalty was less a goal than a full stop, a reminder that Arsenal punish every opening presented to them and even manufacture a few of their own. Raya's clean sheet remained intact, extending a defensive record that borders on the miserly \u2013 one goal conceded across an entire opening month.

Guimar\u00e3es and Rice combined for the opener, Saka sealed it, Raya preserved it: the spine of a team humming in every department. Arteta will have watched with quiet satisfaction, knowing his side won without needing to reach top gear. That, as much as the result itself, is the ominous message for the rest of the division.

What comes next

Top of the pile with a perfect record, Arsenal have set a tempo the chasing pack will struggle to match. Twelve points from twelve, eight goals scored and just one conceded \u2013 these are the numbers of genuine contenders, and the manner of this win, grinding rather than glittering, may worry rivals most of all. When a title challenger can win ugly and still keep the sheet clean, momentum becomes a snowball.

The victory keeps Arsenal clear at the summit and hands Arteta's men the psychological currency of a flawless start. There will be sterner tests than a newly promoted side hunting its first meaningful points, but the habit of winning is a precious thing, and Arsenal are wearing it comfortably. The rest of the Premier League has been served notice.

Sunderland must dust themselves down and turn their attention to the fixtures where points are more realistically won. Fourteenth is no cause for panic this early, but the margin between their four points and safety further up the table demands they convert promise into reward. The spirit is there; the sharpness in front of goal is not, at least not yet. On this evidence, they will need both to climb.