When he joined the tour Laver first played Hoad. After his loss Rod said that Hoad was the best he ever played. After losing to Rosewall the next night, he said that as good as Hoad was, Ken was even better. Hoad seemed to be a bad match up for Gonzales. Hoad was inconsistant, perhaps due to back problems. Ken usually beat Hoad just before and after Lew turned Pro, the year after Ken did. Lew was usually able to beat everyone else on the Pro Tour but he usually lost to Ken in the finals. Ken's list, which naturally does not include himself, is probably based on his results against those players. Also, Ken and Lew were close friends since childhod.
What about Bjorn Borg? You saw him play. He must have been a Genius?