Re: It's Nastase's 1973 the best season ever for a player on clay ?
Borg was 16/17 that year. Nastase's wins against him in 1973 are not that impressive.
Although this was a great year, it's not the best. Borg had years in which he was undefeated and he won two French Opens in his career in which he did not drop a set.
The difference between Borg's best years and those of Nastase ('73) and Vilas ('77) is that Borg played fewer events and almost never bothered with small, mickey mouse ones.
However if you look strictly at percentages Borg won somewhere in the neighbourhood of 97-98% of his clay court matches between 1977 and 1981, inclusive.
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