The 16-year-old gave a calm and composed performance in midfield in what was his first ever game in the Premier League.
The teenager had a 94% pass accuracy, and made two interceptions, two clearances and three blocks.
It was a truly brilliant performance from Oxford, one which led to Merson describing it as “phenomenal”.
“Reece Oxford deserves all the praise in the world for playing so well against Arsenal,” the Englishman wrote in The Daily Star.
“I couldn’t have played like that at 16. You have to put it in perspective and say that was phenomenal.
“You also have to give West Ham boss Slaven Bilic credit for trusting him, because plenty of other managers wouldn’t have done.”
Oxford retained his place in the Hammers’ starting line-up for Saturday afternoon’s Premier League clash against Leicester City at the Boleyn Ground, but he failed to repeat his heroics of his previous game.
Slaven Bilic’s side went down 2-1 to the Foxes, and the youngster struggled to make a major impact before being substituted at half time.
However, that should not decimate the undeniable talent Oxford has, one which will rise to the fore as the season progresses.