PARIS — Before Frances Tiafoe played a point at this French Open, he wasn't particularly enthusiastic about its surface — or his chances in the tournament.
''Last tournament on clay, which I get really excited about,'' Tiafoe said on the eve of the Grand Slam event at Roland-Garros. ''And then we get on the real stuff, the grass and the summer hard courts — where tennis actually matters.''
Might have a different point of view now.
The 15th-seeded Tiafoe made his way into the quarterfinals at the French Open for the first time with a 6-3, 6-4, 7-6 (4) victory over Daniel Altmaier of Germany on Sunday night, joining 12th-seeded Tommy Paul to put a pair of American men in the round of eight.
It's the first time the country placed more than one man in the quarterfinals in Paris since 1996, when Jim Courier and Pete Sampras did it together. Zero men from the United States had made it this far in any year since Andre Agassi in 2003.
The key for Tiafoe?
''Playing hard-court tennis on a clay court,'' he said.
And Tiafoe — who celebrated his win by twice shouting a phrase that can't be quoted fully here but included the words ''let's'' and ''go'' — has done it without dropping a set.