Max Decugis is, behind Rafael Nadal, the most dominant force the sport has ever witnessed on clay. As everyone knows, Mr. Decugis won 8 Roland-Garros titles (the second most only behind Rafael Nadal). Decugis could not defend his 1914 title and Roland-Garros was suspended from 1915 to 1919 due to the World War I. Tennis analysts speculate that Decugis could have added 3 to 5 extra Roland-Garros titles during those years to make it 11-13 Roland-Garros.
Reports from the newspapers of his time express a profound disbelief on the nature of Decugis' seemengly superhuman domination. He was well known for having an exquisite ball touch, a superbly powerful backhand, and a precise forehand (particularly remarkable for its inherenly revolutionary top spin).
But, as it is well known, the human species has the unfortunate practice of forgetting history. Recency bias surrounds any domain, including tennis discussions. Many people automatically disregard Decugis' impressive achievements with the argument that "Roland-Garros only allowed the participation of French players during Decugis' years". Such an argument is easily refuted: Decugis won the Olympic Gold in singles from 1906. The Olympics 1906 were played in outdoor clay, and players from all nations could participate. Thus, Decugis proved to the world in 1906 that he was the best clay player of his time.