Laver won the Italian on clay I believe in 1971 over Kodes. The Italian was the second biggest clay tournament. It shows that it's very possible that Laver would have been a big factor at the French that year. Looking in hindsight on what Laver and Rosewall did after 1971 it is possible that they may have been the two best on clay in 1971. Not saying that they definitely were the two best but they certainly were up there with anyone.