Friday turned out to be too early for the future of tennis.
Three rising male stars challenged the ruling class in thrilling third-round games, but none prevailed.
Karen Khachanov, 22, pushed the best seeds and defending champion Rafael Nadal for 4 hours 23 minutes, but could not finish his comeback in the fourth set, falling by 5-7, 7-5, 7-6 (7), 7 -6 (3).
Denis Shapovalov, 19, picked up on last year's runner-up Kevin Anderson but failed to convert any of his five breakpoints in the fifth set, losing 4-6, 6-3, 6-4, 4-6, 6-4.
Nadal had won his last four games against Khachanov with ease, without dropping a sentence. But Khachanov announced his presence immediately on Friday, hitting Nadal's serve early and often.
"I'm studying it, I'm trying to get ready," Khachanov said. "Of course he also knows what I like doing, how I like to play, so I think the game was great, I was getting better prepared, we say."
Khachanov broke Nadal in his second service match, and again late in the front row, before pouring it out at 7-5.
Taking so much time to respond to Khachanov's serve as possible, Nadal often stood with his back practically against the wall as his opponent was ready to serve. The effect was split: Nadal was able to return 72 percent of Khachanov's serves, but Khachanov hit 22 aces on Nadal's zero.
The biggest surprise might have been in Khachanov's defensive potency. Despite his powerful 6ft 6 construction, Khachanov fought nimbly and often rallied. Khachanov eventually won 31 of the 53 points that held nine or more shots.
"A great opponent," said Nadal in his interview on the court. "I am very happy that I am through, I have escaped a very difficult situation, so this is a good thing."
Khachanov scored nine double faults in the match, and they often came in torrents at critical times. He hit two when he forced a tiebreaker in the second set in the twelfth game of the set. He hit three double faults in the tiebreaker in the third set, including one at 7-7, which gave Nadal a fifth setpoint, which he transformed. Khachanov then hit two double faults when he dropped the serve in the third game of the fourth set.
"You are nervous anyway when you play these tight situations," Khachanov said. "If you're the same in the score or if they're tiebreaks, you make some decisions very quickly, and you only have a few seconds to think about what you'll do, especially if you serve a second serve."  The longest point of the game proved to be the most critical: after Khachanov he gave Nadal an 8- After seven times the Tiebreaks in the third set, the two played a breathtaking 39-round rally, filled with breathtaking defenses, before Nadal finally forced a forehand error from Khachanov.
"Needed this sentence, of course," Nadal
After breaking Khachanov early in the fourth set, Nadal made things harder for himself as he dropped Serve in love while serving for the match.
"That's tennis, no?" He said wistfully. "Probably there is still work to be done for the next round, but the good thing is that I have a chance to improve it."
Nadal has seized the chance to play again when he hits his third match point in the fourth set Tiebreaker, Khachanov missing a hand-back
Nadal will next meet on 37th placed Nikoloz Basilashvili from Georgia with a 6-3, 6-4 for the first time reached the fourth round of a Grand Slam tournament, 1-6, 7-6 (4) victory over Guido Pella.
Anderson, who met Nadal in the quarter-finals in a rematch of last year's final, saved himself from the danger with the effective portion during his win in 3: 34 over Shapovalov. Although he beat only 11 aces, two less than Shapovalov, Anderson was effective at his hits, with 46 percent of his markups not being returned.
"Definitely more experience than he," said Anderson of Shapovalov. "Maybe that helped me at certain moments, but I definitely needed to use everything to get through today, it definitely did not make it easy for me out there."
In the first match, under a closed roof over the new Louis Armstrong Stadium was discharged, Anderson Shapovalov broke early in the fifth set with a strong backhand down. Newline that Shapovalov could not return. Anderson held on and fended off five consecutive Shapovalov breakpoints.
"I gave everything I had," said Shapovalov. "Nothing to regret."
Last year Thiem tricked the demons of his fourth round against Juan Martín del Potro on the grandstand square with his four-figure victory over Fritz and turned the tide in a jostling third set. Thiem struck his club several times against the hard surface as Fritz took the lead 3-0 and punished the pitch penalty court after a Fritz forehand dribbled over the net line for a winner.
"I may not have pumped up the best ways," Thiem said. "But still, I pumped myself up."
The destruction turned out to be cathartic. Thiem leveled the set to 4-4 and then won in a tiebreaker.
Fritz was broken five times.
"I think my serve is one of my best shots, so I was disappointed," he said. "I had a break twice in the third round and could not win the third set."
The end was not easy. With a comfortable 5: 30-0: 0 lead in the fourth set Thiem suddenly hit three double faults in the next four points and also threw a backhand emergency error. The spirit of his collapse a year ago flashed before him.
"Juan reappeared," Thiem said.
Juan did not stay long; Thiem collapsed in the next game to end the game.