Beating the Lilywhites was extra special for the 17-year-old.
Slaven Bilic's side have beaten Arsenal, Liverpool, Manchester City and Chelsea this season, but last night was arguably the most impressive given Spurs' form and what was at stake.
It moved them one point behind fourth-placed City in the race for Champions League qualification, and a top-four finish, with 10 games left now seems a genuine prospect.
But the win was extra special for Oxford and his mother, on account of them both being Arsenal fans!
The highly-rated 17-year-old midfielder, who replaced defender James Collins after 66 minutes, told West Ham's official website why the win was so satisfying.
“It was a good game,” he told West Ham's site. “I was a bit surprised when I got thrown in because at half-time I got told to be ready, but that was for Angelo and not Ginge, as Angelo had a little knock but he’s fine now.
“When it happened, they were just screaming at me to get back to the bench and get ready, so I got ready and went on. The players alongside me, Angelo and Cheikhou, really helped me out.
“It was a big result for the Club and for where we are in the table. Personally, me and my Mum like to always beat Spurs!”
Oxford might then have been left slightly bemused to discover that over in North London his boys had lost 2-1 at home to Swansea City in a defeat which has cast major doubts over their title credentials.
But for West Ham, everything is swell, and Oxford will hope to play a more prominent role in the coming months as they chase a top-four finish.