The 18-year-old English forward became the club’s youngest-ever goalscorer in European competition after netting against FC Astana in the 2019/20 Europa League. He also became the youngest player in United's history to start a Premier League match.
He's scored two goals in nine appearances in all competitions this season.
Greenwood's bright future
The U21 England international has been with the Red Devils since the age of seven.
“Having grown up as a Manchester United fan, playing for the first team is a real dream come true,” said Greenwood.
“I know that, when I play for this club, I represent the whole Academy and I want to repay the faith that my coaches have shown in me with my performances on the pitch.
“I am learning all the time from the manager and his coaching staff and I know that this is the perfect club to help me reach my potential.”
Manchester United boss Ole Gunnar Solskjaer has been singing the kid's praises, calling him the team's best finisher.
“At such a young age, he already has great pace and intelligence and he is such a natural finisher,” said Solskjaer. “Since he came into the first team, he has really impressed everyone with his drive and attitude, he has all the attributes to become a top player.
“Mason is learning every day in training and, with his work ethic, there is no doubt that he has an excellent future ahead of him.”
Manchester United take on Liverpool at Old Trafford this Sunday. Watch the game live at 11:30 a.m. ET Sunday on NBCSN and online via NBCSports.com