Kevin Anderson earlier beat Spain's Pablo Carreno Busta in four sets to advance to his maiden major final.
After 12th seed Carreno Busta's forehand found the net to end the almost three-hour contest, Anderson smiled and put his hands on his head before climbing into his player's box to embrace his wife, brother and coach Neville Godwin.
As he digested congratulatory texts from compatriots such as Wayne Ferreira, the last South African man to make the semi-final of a major in Australia in 2003, and golf superstar Ernie Els, a four-time major victor, the 31-year-old Anderson has bigger targets.
He now awaits the victor of the second semi-final between World Number one Rafael Nadal and Argentine Juan Martin Del Potro. Anderson made the most of his opportunity, nailing a backhand victor to take the set 7-5 and level the match. The South African won his opening three rounds in straight sets against JC Aragone, Ernests Gulbis and Borna Coric respectively.
"It's nice, " Anderson said, "that some of them gave us a bit of a shot to make a run in this tournament".
05:06 Take a look at the final stats from the match. Kevin Anderson hit 58 winners including 22 aces
But that was sufficient as 6ft 8in (2.03m) Anderson committed 14 unforced errors as he dropped serve for just the fourth time in the championships.
"I was able to play loose and "Bam", here we are". "I think there have been a lot of successful college players to come through, and I hope that trend continues because it's a very valuable experience". Will the big-server and former top-tenner from South African have too much to handle for Carreno Busta?
Carreno Busta is anticipating another tough match when he takes on Schwartzman. "It was windy and we both struggled for rhythm and this a new ground for both of us‚" Anderson said. I have to get ready. Nadal leads their head-to-head series 8-5, but del Potro won their most recent matchup, on a hard court at the Rio Olympics a year ago.
Given the level of opposition, it's very hard to get a read on where Carreno Busta is.
"I always try to practise with him because it's really important to me, to be near the best players and practise with them", he said.
Del Potro was the U.S. Open champion in 2009, when he beat Nadal in the semifinals and Roger Federer in the final.
"I don't know if it's appropriate, " Anderson said. "I was told I probably needed surgery on my hip", Anderson said. "I feel like I've kept my head down and kept working hard".
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Del Potro upsets Federer in US Open quarters
As for his four squandered set-points in the tie-breaker, Federer said: "I don't think those four points made all the difference". Del Potro saved two set points in the third set tiebreak before claiming the set with a sensational crosscourt backhand victor .
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