History was made at Arthur Ashe on Tuesday night.
It was led by a new American hero: Francis Tiafoe.
He was a big threat to ninth-ranked Grigor Dimitrov, upsetting the favorite to reach the semifinals.
This ensures that the United States will have a man in a major final for the first time since Andy Roddick at Wimbledon in 2009.
In a closely fought match, Tiafoe beat Dimitrov in four sets, 6-3, 6-7, 6-3, 4-1, in three hours and four minutes after the Bulgarian was forced to withdraw with an injury.
Leading 4-3 in the third set, Dimitrov visibly slowed down, occasionally clutching his left hamstring and walking very cautiously between points.
He struggled to fight and two unforced errors allowed Tiafoe to take the set.
Dimitrov was hoping it would pass, but he called off the match in the fifth game of the final set.
With the win, Tiafoe advances to his third career Grand Slam semifinal and will face fellow American Taylor Fritz, who beat No. 4 Alexander Zverev on Friday.
This will be the first Grand Slam semifinal between Andre Agassi and Robbie Ginepri at Flushing in 2005, when Agassi won.
“I've been playing against him since I was 14 years old, so to be able to play against him in one of the biggest matches and stages in the world is awesome,” Francis said of facing Fritz.
