Re: Why didn't Roy Emerson turn professional?
Roy did turn pro in 1968 but he got roughed up by the likes of Laver, Gonzales, Roswell, and the gang. But he did reach the Quarters of the French in 1968, the Quarters of the U.S. Open in 1969, and Wimbledon in 1970. He was more of a 4th rounder in slams in singles but he still won titles with Rod Laver in doubles.
But I do think he could have won some Grand Slam titles due to his athleticism if they allowed pros in 1960. But by 1968, he got old and the pros came.