The top spots in every competition tend to be monopolised between the Spaniard, Federer and Djokovic every year but Courier expects a big change once they retire.
"It would be an understatement to say this would be the biggest win of his career if he can pull this off given where he was mentally coming into this tournament", John McEnroe said of Dimitrov during the match.
Bulgarian upstart Grigor Dimitrov upset the 20-time Grand Slam titlist in five sets, winning 3-6, 6-4, 3-6, 6-4, 6-2 to advance to just the third Grand Slam semifinal of his career, where he will meet No. 5 Daniil Medvedev on Friday. At Wimbledon in July, Nadal lost in the semifinals to Federer, who went on to lose a almost five-hour final to Djokovic in a fifth-set tiebreaker.
Tennis legend Jim Courier believes Roger Federer, Rafael Nadal and Novak Djokovic's era of dominance will come to an end in the next five years. She is chasing a 24th Grand Slam title at the US Open to match the all-time record won by Margaret Court.
Meanwhile, Medvedev has ridden a hot streak into the other semi-final, where he unexpectedly finds himself up against an opponent few expected to go deep into the championship.
But Medvedev eventually won 3-6 6-3 6-2 7-6 (2), before goading the crowd again with his celebration and then saying in his courtside interview: "Guys, continue to give me this energy".
The result ended Koepfer's incredible run in NY, after the 25-year-old came through qualifying to make the main draw, where he beat Reilly Opelka and Nikoloz Basilashvili to advance to the last 16. "Come on! I want to catch my cartoons".
Federer only this week said he felt physically fit enough to carry on playing into his 40s.
"I'm complaining on a very high level now, when you're trying to go for your fifth Wimbledon, trying to break the all-time Grand Slam record, and Pete is sitting there or Borg sitting there, and you're like, 'Oh, my God, what are they going to be thinking?'"
"I found my groove after a while and was able to roll really".
Dimitrov has slumped to 78th in the world after winning only one match since Wimbledon until this week and enduring a humiliating loss to world No. 405 Kevin King last month in Atlanta, where de Minaur collected his second title of the year.
To make it even more ironic, he performed great just when neither of his two coaches, Agassi or Stepanek, traveled with him. It was just obviously injury, losing points, ranking. That's the lowest point of any player. But I had somebody to lean on, my friends, my family.
"It has helped me at times". I think still it's been a positive season. "Next thing you know, you're nearly (at the) end of the year, you have a result like that. It's pretty special to me".