Well, I guess we may disagree on the significance of 100 wins with a 50+ margin of wins over losses. To me, that sounds like a great season, and it overshadows seasons where the top guy wins 50 or 60 matches. There is much more effort and CONSISTENCY required to get to 100, and to do it twice against strong fields (as Gonzales and Hoad did) is a signal indicator of dominance.
I am not sure what your objection is to 100 as a marker. Sure, we could reduce it to 90 or 80, but then the numbers of players swell out and the distinctive nature of the achievement becomes more commonplace. That does not help us to separate the men from the boys.
I think of 100 as a minimum, as many of the achievers passed 110 or more. Today, the players are physically incapable of playing that many matches, so they are supposed to get a bye on this? Sorry, those are the breaks. If you don't play, you don't win.
I am confused about your Rosewall statements. Sure he spent the early months of each year in Australia, but he wasn't playing with his children at home, he was competing fiercely on the tennis court. Only in 1961 did he sit out.
Apart from 100 wins, which the pros themselves talked about as an indicator of achievement, the strength of the field should be taken into account, I am not sure why you would ignore that marker, it is crucial in evaluating any year. 100 wins is not the only marker but it does help eliminate some years on an a priori basis.
I just listed about 20 consensus "all-time seasons" or "dominant" years that would not be considered such under your narrow criteria. Most of the greatest players with the greatest seasons would be left out. That is my "objection".
1920-30s, only Tilden reaches 100, in four years, and this after his peak. Vines does not, Perry does not, Budge does not, nobody does.
1940 and '41 - Bobby Riggs wins 101 both years. These are not generally considered dominant years and Riggs is farther down the list of the greats.
1948 and '50 - Jack Kramer, owing to very long WCS against Riggs and Gonzalez, respectively.
1950 and 1952 - Jaroslav Drobny (104-8 in 1952). Not known as dominant years and Drobny is a special case: stateless and staving off depression, he needed to play tennis 12 months a year.
Trabert 1955.
Gonzalez twice, 1956 and 1957. These are all-time, mega seasons, two of the very few that qualify as such under the 100+/50+ stringency.
Hoad twice.
AGAIN YOU MISREPRESENT HOAD TO US. He did not make your 50-plus victory margin in 1959, but was 100-61. Don't be calling this a dominant year, please, Dan. You can read the record as well as anyone.
Speaking of the record - you will see that 1958-62, at least, there is a gap in Rosewall's record between late January and late April or May. He doesn't play any matches. Yes, he stayed home to be with his family. Sure he practiced, and he probably played some exhibitions, but he was there in order to be with his family.
Moving into the Open Era, Connors ('76) and Borg ('78 and '79) only just barely hit 100, but you have to count plain exhibition matches - which you said in the other thread you don't want to do - not just independent tournaments. But only the '79 Borg year is "dominant".
Ivan Lendl played 102 matches in 1985, counting only official and non-sanctioned tournaments, not exhibitions. In 1989 he won 105 counting the independent tourneys, no exhibitions. Earlier in his career, in 1980 and 1982, he won more than 100 official matches, but those are not "dominant years." Although all splendid years, none of these four are all-time mega seasons. For Lendl, those would be '86 and '87.
Finally, as I mentioned before, the 1984 McEnroe season, widely considered one of, if not the, best single season, fails to meet your manliness criterion, as Junior only won 96 matches.
Since Lendl, I don't believe any player has won 100 matches.
So, you are left with recognizing . . . what? Of these 100-victory years, Gonzalez '56 and '57 qualify otherwise as all-time, or dominant years. Laver '62, '67 and '69 can be counted. (IMO the Kramer '48, Trabert '55 and Hoad '56 make the list of greatest single seasons, but at the bottom of that list).
No Tilden
No Lacoste
No Cochet
No Crawford
No Perry
No Budge
No Rosewall
No Connors
No Borg
No McEnroe
No Lendl
No Sampras
No Federer
No Nadal
No Djokovic
Enjoy your list of "truly dominant" seasons.