At least Barker won a grand slam (LOL must of been an uber weak era).
Castles best career achievement was making the Quarter Final of Queens. LOL.
Career record 22–57 (27.85% at ATP Tour, Grand Prix tour, WCT tour, and Grand Slam level, and in Davis Cup)
Career titles 0
Highest ranking No. 80 (13 June 1988)
Don't mess with the GOAT.