Sunderland travel to the Emirates on Saturday in a Premier League fixture that doubles as a delayed rematch of November's 2-2 draw, one of only two results this season to prevent Arsenal from claiming victory.
That afternoon at the Stadium of Light appeared to mark a rare crack in Arsenal's defensive structure, and just three months later, league performances tell a revealing story.
Arsenal sit top of the table on 54 points and remain favourites for the title, while Sunderland are comfortably positioned in mid-table, nine points clear of relegation concerns, and firmly established as a resilient second-tier graduate.
The league leaders now host opponents who have already demonstrated how to destabilise them, while the side that took points in November arrive with proof that their approach was no anomaly.
In that fixture, Sunderland ended an 11-game clean sheet run for Arsenal and disrupted a side that had been closing in on a club-record defensive sequence.
Since then, Arsenal have dropped further points against Nottingham Forest and Manchester United, with defensive lapses late in matches undermining periods of otherwise controlled possession.
Sunderland's 3-0 victory over Burnley on Monday reinforced their credentials as a disciplined, professional outfit capable of executing clear tactical plans under pressure.

Arsenal's dominance this season has been built on territorial control, set-piece efficiency, and sustained possession phases. Sunderland disrupted all three in November.
By compressing the space around throw-ins, flooding the central areas, and relentlessly contesting second balls, Sunderland disrupted Arsenal's usual rhythm and forced mistakes in advanced areas.
Since that fixture, Arsenal have shown similar vulnerability when matches remain tight into the final stages.
Having dropped points against Nottingham Forest and suffered a defeat to Manchester United, Sunderland could disrupt the league leaders once again by forcing Arsenal into defensive errors under sustained pressure.
Arsenal's injury crisis has reached critical levels heading into Saturday's fixture, with Mikel Merino requiring foot surgery that will rule him out for an extended period.
Merino has made 33 appearances this season and scored six goals, becoming a crucial rotation option in Arteta's midfield as Arsenal compete across the Premier League, Champions League, and League Cup.
PA
His absence places an additional burden on Declan Rice, who recently reached 300 Premier League appearances. Kai Havertz continues managing fitness issues following a knee injury setback.
Bukayo Saka and Max Dowman remain sidelined, and the midfield strain could force Arteta to rely on summer signing Eberechi Eze or academy graduate Myles Lewis-Skelly against Sunderland.
Despite leading the Premier League by six points and holding a 3-2 aggregate advantage in the League Cup over Chelsea, Arsenal's squad depth is now under serious scrutiny after the transfer window slammed shut on Monday.
The conditions are precisely those Sunderland thrived in during November: a stretched midfield unable to control second balls, defensive uncertainty in transitions, and a side forced to rely on unfamiliar combinations under pressure.
Sunderland's 3-0 win over Burnley demonstrated their ability to execute structured game plans and that same blueprint now faces an Arsenal side significantly weakened from the one that escaped the Stadium of Light with a draw.
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