Arsenal managed to edge Cardiff City 2-1 on an emotional night at the Emirates.
Cardiff played for the first time since the disappearance of striker Emiliano Sala.
The 28-year-old Argentine forward and pilot David Ibbotson were on board a light aircraft that disappeared from radar over the Channel Islands while travelling from Nantes following Sala's club-record £15m move to Cardiff.
Tributes were paid to Sala before the game from both sets of players, club officials and supporters.
Neither side had a shot on target in the first half, but Arsenal went ahead through Pierre-Emerick Aubameyang's 66th-minute spot kick after Bruno Ecuele Manga had clumsily brought down Sead Kolasinac.
Alexandre Lacazette doubled Arsenal's lead with a fine low strike into the bottom corner, although substitute Nathaniel Mendez-Laing pulled one back for Cardiff in added time when he curled a shot past Bernd Leno.