Kevin Anderson defeated Sam Querrey to become the first South African to reach the semi-finals of a grand slam for 14 years.
The 31-year-old came out on top of a predictably tight encounter on Wednesday at Flushing Meadows, with Anderson winning 7-6 (7/5) 6-7 (9/11) 6-3 7-6 (9/7).
Not since Wayne Ferreira at the 2003 Australian Open has a South African made the last four at a slam, while Cliff Drysdale in 1965 was the last man to do so in New York, when the tournament was still amateur.
He said: “This is incredible. Playing on this stage, one of the most famous courts in the world in a night session, getting through feels absolutely fantastic.”
In one of the most unlikely slam semi-finals of recent years, Anderson will take on Spain’s Pablo Carreno Busta for a place in the title decider.
Anderson was keen to savour his achievement before focusing on that challenge, saying: “This is very special for me, I’m going to try to enjoy it a little bit.
“It’s going to be a tough battle, but I’m just so excited to be competing in a semi-final of a grand slam.”
Meanwhile, the Springboks congratulated Anderson after South Africa’s top tennis player reached the semi-finals of the US Open.
The Boks are currently in Perth preparing for a Rugby Championship encounter against the Wallabies, but have also kept their eyes on the year’s final tennis Grand Slam taking place in New York.