let him make it to the majors before he breaks mantles record
Ted William's longest home run in Fenway Park was 502 feet, but I don't know if that was his longest home run ever.
The longest home run was made by Ryan Howard. 536 ft.
Ronnie Green of the KC Royals hit the longest home run at Fenway Park in 1987
The longest home run of 2009 belongs to Waldemar Balentien of the Cincinnati Reds. It was measured at 495 ft.
Justin Upton
507 feet by prince fielder
525 feet
760 ft.
603 ft
Canseco
Mickey Mantle