What male tennis player has won the most French Open singles Titles?

Men - Before 1968, it was Max Decugis, with 29 titles. After 1967, it was Bjorn Borg, with 6 titles.
Women - Before 1968, it was Suzanne Lenglen, with 15 titles. After 1967, it was Martina Navratilova, with 11 titles.