That's seen Greenwood pit his skill and pace against some of the best defenders in world football.
Mason Greenwood struggles to get the better of Joe Bryan during Manchester United's Premier League meeting with Fulham at Craven Cottage back in January
The teenage United forward has named Bryan as his toughest opponent in a fan Q&A session
But when asked in a Q&A session with fans which opponent has caused him the most frustration, Greenwood certainly raised a few eyebrows.
'I've probably got to say, it