A David Raya penalty save sparked a rapid turnaround at the Stadium of Light, leading to goals from Bruno Guimaraes and Bukayo Saka to keep the Gunners atop the table.
A rejuvenated partnership between Kai Havertz and Martin Ødegaard overturned an early deficit to keep Mikel Arteta's side level with Manchester City at the top.
The transfer represents pure profit for Arsenal, who have overhauled their attack following the departures of Martinelli, Gabriel Jesus, and Leandro Trossard.
As Manchester City matched the British transfer record for Enzo Fernández, Arsenal opted for internal solutions after a quiet transfer window.
Bolstered by squad continuity and new midfield additions, Arsenal enters the new campaign as the overwhelming favorite among experts despite widespread managerial changes across the league.
Mikel Arteta and Enzo Maresca navigate major squad absences and late transfer dealings as Arsenal and Manchester City meet in Cardiff for the Community Shield.
The 28-year-old midfielder arrives at the Emirates Stadium on a £75 million deal after spending four and a half seasons with Newcastle United.
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Arsenal have reached a formal agreement with Newcastle United to sign captain Bruno Guimaraes for a £75 million fee. The midfielder has been given permission to travel for a medical after intervening directly to leave the club.
Mikel Arteta is personally leading Arsenal's pursuit of the Brazilian forward as Real Madrid president Florentino Pérez refuses to break the club's salary hierarchy.
A financial deadlock over salary demands has left the Brazilian forward's future uncertain, with Arsenal emerging as a primary suitor.
Captain Bruno Guimaraes missed the initial team flight to Spain as Newcastle appoints Matthias Jaissle following the abrupt exit of Eddie Howe.
The potential move follows the immediate departure of manager Eddie Howe and Newcastle's failure to qualify for European competition.
Real Madrid manager Jose Mourinho has urged the club to ensure Vinicius Jr stays amid stalled contract talks and transfer interest from Arsenal.
Arsenal are monitoring Vinicius Jr as contract talks with Real Madrid face hurdles over salary demands and a €160 million asking price.
Arsenal have emerged as contenders to sign Real Madrid forward Vinícius Júnior after making an initial inquiry for the Brazil international.
Arsenal have completed the £34 million transfer of winger Christos Tzolis from Club Brugge to replace the departing Leandro Trossard.
Arsenal are intensifying their pursuit of Bruno Guimaraes, preparing a second offer for the Brazil international as they look to strengthen their midfield.