Federer and Djokovic alone provided far more strong opposition on clay for Nadal than any combination of grass courters did against Sampras. Here's some data to show just how formidable these two were:
1. Djokovic has won no fewer than NINE clay Masters. He beat Nadal in five of those, as well as in Rome 2016, which he eventually lost to Murray. He also beat Nadal in French 2015. He has won on clay at a .796 rate. Muster, the clay winning-percentage leader of the 90s, in comparison, ended with a .769 record, and much of his success was achieved at tournaments which would be regarded as 250 level today. Nadal defeated Djokovic six times at the French and ten times in clay Masters.
2. Federer has won the Hamburg/Madrid clay Masters six times. He's also been a ten-time finalist at clay Masters, with seven of the losses to Nadal, as well as another in a SF. At the French, Nadal has defeated him six times. Federer currently has a .761 winning rate on clay.
3. Sampras's most frequent opponent at Wimbledon was Ivanisevic, and to claim that his effectiveness on grass matches that of either Djokovic or Federer on clay is BS. For one thing, he was eliminated four times between 1991 and 1997 by players ranked number 30 or worse. Yes, he did beat Sampras in 1992, but that's before Sampras hit his stride. It's perhaps comparable to Nalbandian's win over Federer at US 03. He managed to serve his way to a .720 mark on grass, and if you don't believe it's mostly the serve that did it for him, check his results at the hard court majors. In terms of frequency of encounters, Sampras's next biggest challenger was Becker. but only in 1995 was he having an excellent season.
All this having been said, if my life were on the line depending on the outcome of a grass court match, I'd still probably take Sampras over anyone else, but if it were a choice between Sampras on grass and Nadal on clay, it's Nadal without a moment's hesitation.
1. Djokovic has won no fewer than NINE clay Masters. He beat Nadal in five of those, as well as in Rome 2016, which he eventually lost to Murray. He also beat Nadal in French 2015. He has won on clay at a .796 rate. Muster, the clay winning-percentage leader of the 90s, in comparison, ended with a .769 record, and much of his success was achieved at tournaments which would be regarded as 250 level today. Nadal defeated Djokovic six times at the French and ten times in clay Masters.
2. Federer has won the Hamburg/Madrid clay Masters six times. He's also been a ten-time finalist at clay Masters, with seven of the losses to Nadal, as well as another in a SF. At the French, Nadal has defeated him six times. Federer currently has a .761 winning rate on clay.
3. Sampras's most frequent opponent at Wimbledon was Ivanisevic, and to claim that his effectiveness on grass matches that of either Djokovic or Federer on clay is BS. For one thing, he was eliminated four times between 1991 and 1997 by players ranked number 30 or worse. Yes, he did beat Sampras in 1992, but that's before Sampras hit his stride. It's perhaps comparable to Nalbandian's win over Federer at US 03. He managed to serve his way to a .720 mark on grass, and if you don't believe it's mostly the serve that did it for him, check his results at the hard court majors. In terms of frequency of encounters, Sampras's next biggest challenger was Becker. but only in 1995 was he having an excellent season.
All this having been said, if my life were on the line depending on the outcome of a grass court match, I'd still probably take Sampras over anyone else, but if it were a choice between Sampras on grass and Nadal on clay, it's Nadal without a moment's hesitation.