I say there is a decent argument to be made that Novak will go down as third best clay court player of all time if he wins the FO.
He has dominated clay Masters events even if his dominance has been overshadowed by Rafa. If he weren't playing in Rafa's era, he'd probably have 4-5 FO and an absurd amount of clay titles.
His major competition for top 3 are Lendl and Vilas. On paper, those guys have sexier stats, but the key point is that they DID NOT HAVE TO DEAL WITH NADAL THEIR ENTIRE CAREERS!
I'd say that Djokovic is easily top 5 without the second FO and is top 3 on clay if he wins.
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It Might make him the overall G.O.A.T., but not sure about top-three on clay. Before his victory Monday, I had him at the bottom of my all-time top-10 on clay, although I think would bump him up just a bit, of course, based on the fifth Italian Championship, on a list where 7-10 are so close. Were he to triumph at the
Porte d' Auteuil come October 11, I'd probably have him tied for fifth all-time on clay. He has been slightly underrated as a clay-court player. Waspsting has a thread with good description and minute statistical details of his near-victory over Nadal at the French SF in 2013.
Rafael Nadal (Obvious)
Henri Cochet (4 amateur Slam titles at “Roland Garros Tournament,” a/k/a French International Championship of Tennis, and 1 French Pro,
plus 1 World Hard Court Championship, in all respects equal to a Slam; 3 Monte Carlo titles; approximately 60 total clay-court titles; 22-3 Davis Cup singles record on clay; 82.3% career clay winning percentage)
Björn Borg (6 French Open titles in 8 participations, 1973-81; 3 Monte Carlo titles and 2 Italian Open; Continental Double; won 26 consecutive clay-court singles rubbers in Davis Cup; 82.6% career clay winning percentage)
Ivan Lendl (3 French Open championships in 5 finals; achieved “Clay-Court Grand Slam” two-times over (French, Italian, Monte Carlo and Hamburg/Madrid, despite playing the three top non-Slam tournaments only 11 times between 1981-90; Continental Double; 28 clay titles; 81% career clay winning percentage)
Ken Rosewall (6 RGs in total - 1 Roland Garros championship in 3 participations as amateur, all as teenager;
winner of first French Open, 1968 and finalist in 1969, after which did not compete; 4 French Pro titles on clay at Roland Garros; additional 10 significant clay titles; approximately 40 total clay titles; 74.1% winning percentage)
Gustavo Kuerten (3-time French Open Champion; twice Monte Carlo champ, plus Italian and German Open titles; joined the exclusive career Clay-Court Grand Slam club at age 23; but at age 25, a serious hip injury hobbled his game so badly he was no longer competitive; from his breakout at 1997 Roland Garros through 2001 and the arrival of the hip injury, Guga enjoyed an 81% clay winning percentage)
Rod Laver (twice winner at Roland Garros, amateur and Open era; 2 Italian championships; 2 German championships; 1968 French Pro title on clay; 1 Geneva Gold Trophy title; 1971 Italian Open title was effectively the clay-court Slam that year, with a vastly stronger field than the French Open; did not participate at French Open after 1969; more than 50 clay-court titles; 79.4% career clay winning percentage)
Jaroslav Drobny (2 championships at Roland Garros in five finals; 3 Italian titles, plus titles at Monte Carlo and German International Championships; as a result, first player to accomplish the career Clay-Court Grand Slam; Continental Double; 4 British Hard Court championships; approximately 90 career clay-court titles; 80.4% career clay-court winning percentage, i believe, in a career that really did not start until he was 25)
Rene Lacoste (3 French Championships in 5 consecutive finals, 1925-29; playing a limited schedule, won an additional eight significant clay tournaments, including 2 British Hard Court Championships; 15-1 record in Davis Cup matches on clay, 1924-29; serious respiratory illness caused his retirement at 25 years of age)
Novak Djokovic (1 French Open championship in 4 finals; four Italian Open championships; career Clay-Court Grand Slam and 9 Masters 1000s (counting the 4 Italian titles); 8-2 Davis Cup clay-court singles; 79.6% career clay-court winning percentage)
This is pre-Rome 2020 - Nole now has 5 Italian and total 10 M 1000s. His winning percentage must now be close to 81%.