The Sunderland youngster has become a star man in recent weeks.
The youngster was named once again named as a substitute for the Black Cats, having started on the bench against Crystal Palace last Monday as well.
As in that game, he came on to make a telling impact, with this match seeing him bag his side's second late on to secure three vital points.
It was a special moment for the highly-rated youngster, and Watmore is hoping it will help his side build some momentum going forward.
“It’s a massive win for us today and we know that. To score in front of those fans was a special moment for me,” he told safc.com.
“It’s such a hard league, when you’re winning away from home and then at home, you’re taking that into your next game and that can only be good.
“We knew we needed two wins and that’s what we got. Hopefully we can take this momentum into our next few games and go from there.”
The win was certainly a big one for Allardyce’s side, as it moved them out of the Premier League relegation zone at the expense of fierce rivals Newcastle United.
The Black Cats now sit 17th in the table, two points clear of Bournemouth and the Magpies in 18th and 19th respectively.
Sunderland are starting to show good form now, having won as many league games in six matches under Sam Allardyce as they had in 17 under Dick Advocaat.