Her winning percentage was the best ever for a post-1968 professional tennis player .
Navratilova 's loss at the French Open was her only singles defeat during that year , during which she established an 86 -- 1 record .
Navratilova 's winning percentage was the best ever for a post-1968 professional tennis player .
Navratilova 's loss at the French Open was her only singles defeat during that year , during which she established an 86 -- 1 record .