Bournemouth got off to a quick start with Philip Billing scoring the second fastest goal in Premier League history after only about 10 seconds.
Despite the best efforts of Mikel Arteta’s men, they could not find a breakthrough in the first-half as Leandro Trossard went off injured shortly before half-time.
At the start of the second-half, Mikel Arteta brought on Benjamin White for Takehiro Tomiyasu, but the Gunners fell to a second goal just 10 minutes after the break.
Marcos Senesi headed home from Bournemouth’s only corner-kick of the match. In contrast, Arsenal had managed about 10 times this number of corner-kicks at this point of the match and finished the match with a whopping 17.
The comeback started in the 62nd minute when Thomas Partey scored from close range before substitute Benjamin White got his first goal as an Arsenal player to equalize in the 70th minute.
The next 20 minutes saw the Gunners pile up the pressure and they were rewarded late into injury time as another substituete Reiss Nelson scored with his weaker foot from the edge-of-the-box after a half clearance from a corner-kick.