Arsenal star Gabriel Martinelli scored a dramatic late goal to see off Manchester City at the Emirates Stadium on Sunday.
The Brazil international was introduced at half time having recovered from injury ahead of schedule.
And Martinelli was the hero as Arsenal got their first win over Manchester City for the first time in 13 meetings.
The Samba star's deflected strike in the 86th minute was enough to secure victory, with Kai Havertz playing a key role.
Arsenal players celebrate Gabriel Martinelli's stunning late goal against Man City
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Havertz has endured a slow, unspectacular start to life in north London since touching down from Chelsea back in the summer.
But his assist was a vital one.
The ball fell to the Arsenal star on the edge of the box and, noticing the run of Martinelli, he then passed to his team-mate.
The Brazil international did the rest, with his powerful strike cannoning off Nathan Ake and into the net past a helpless Ederson in the City goal.
It was a goal met by wild celebrations around the Emirates Stadium, with Arsenal fans now dreaming of a title charge once again and a first league crown since 2004.
They're now level on points with Tottenham, with their north London rivals sitting top of the Premier League table.
It wasn't a classic at the Emirates, with both sides unable to operate at their best.
But Arsenal won't care and will feel justice has been done.
Mateo Kovacic should potentially have been dismissed in the first half, with the Croatia international extremely fortunate to stay on the pitch.
He was given a yellow, instead of a red, for a wild tackle on Gunners star Declan Rice.
And Kovacic was fortunate to avoid a second yellow for a foul mere minutes later.
David Raya looked shaky in the Arsenal goal during the first 45 minutes of the contest.
Julian Alvarez nearly capitalised on some uncertainty, with the Argentine unlucky as he attempted to tackle the Gunners goalkeeper.
It was a match of few chances.
But Arsenal will be delighted with the victory, having failed to beat City in the top flight since 2015.
The international break is now nigh.
Arsenal will be confident they can last the course, having come close to beating City to league glory earlier in the year.
And Pep Guardiola has much to dwell on.
City have now lost successive league games for the first time in five years, having fallen to defeat away at Wolves last weekend.
They were also recently dumped out of the Carabao Cup by Eddie Howe's Newcastle.
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Arsenal boss Mikel Arteta was delighted after his side's stunning win over Man City
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City were surprisingly toothless during the defeat to Arsenal, with the threat of Erling Haaland easily nullified.
Of course, great teams always respond and few are betting against City just yet.
They do, however, look like a side struggling to get to their best form during the early embers of the campaign so far.
