Antonio scored the only goal of the game for the Hammers against Sam Allardyce’s side, after cutting inside and curling the ball into the bottom corner.
The powerful wide-man now has four Premier League goals to his name, and he says that his finishing was something he has been working hard on in training.
"I put five in five of my finishes in at training [like the goal] so I thought I would have a go," he said.
Antonio had to bide his time after joining West Ham from Nottingham Forest last summer, but his patience has been rewarded now.
The rapid winger seems to have forced his way into Slaven Bilic’s first choice starting line-up, and he has proved to be an excellent addition for the Hammers.
Antonio’s work rate and desire has stood out all campaign, and he is starting to add a cutting edge to his play.
The 25-year-old has racked up 15 Premier League appearances in his first season playing in the top flight, and he has made the step up look easy.
Antonio’s winner for West Ham against Sunderland was hugely important, as it fired Bilic’s men up to fifth in the Premier League standings.