During the 1960-61 season , Jimmy Greaves scored hat-tricks against Wolves , Blackburn Rovers and Manchester City and scored five goals in a 7-1 win against West Bromwich Albion .
His hat-trick against Manchester City on 19 November included his 100th league goal , making him the youngest player to pass the 100-goal mark , at the age of 20 years and 290 days .
Jimmy Greaves