While victories over JC Aragone, Ernests Gulbis, Borna Coric and the risky Paolo Lorenzi were all high quality, it was the quarter-finals here he really appeared to hit his stride.
Anderson ended the hopes of American Sam Querrey in the quarter-finals and is the first South African player to make the last four at a grand slam since Wayne Ferreira 14 years ago.
Anderson said: "It's definitely an unbelievable feeling being in this position and I have worked very hard to get here".
Four American women, also including Madison Keys and CoCo Vanderweghe, have reached the quarter-finals for the first time since 2002 and they could produce the first all-US semi-finals in NY since 1981.
Stephens, who returned to competition at Wimbledon after almost a year off because of a foot injury, recovered from a second-set meltdown to end ninth seed Williams's hopes of reaching a third major final this year. If Anderson is not able to win enough free points with his first serve, then he will not come away victorious.
Local gas price skyrockets nearly 30 cents per litre before long weekend
In Vancouver, McKnight predicted little change on the weekend but McTeague says he expects a five-cent jump on Saturday. Midwest market. "To put that into perspective, that's about 10 to 20 per cent more than all the gas needs in Canada".
The Spaniard closed it out but Anderson settled down after a see-sawing second set and delivered his 20th ace, a 212kmh bullet, to take the third. It was the first time when Anderson's game was stretched to four sets but the Italian failed to stop Anderson's stunning run at the US Open, losing by 6-4, 6-3, 6-7, 4-6. Carreno Busta double faulted to give him the set.
Spain's 12th-seeded Pablo Carreno Busta, who hasn't dropped a set so far, takes on 28th-seeded South African Kevin Anderson.
But it is Anderson and his huge serve - he has reached 137 miles per hour during the tournament - that has come through to the final on the bottom half.
This is the second Grand Slam title for Tecau and Rojer, who won Wimbledon in 2015. Anderson served out the match on his serve when Carreno Busta netted a forehand.
Nadal struggled to handle his opponent's serve and huge forehand in the opening set before finding his stride. "It's little things", Anderson said. He played his typical steady, if unspectacular, brand of tennis, earning two winners against just one unforced error. Nadal is 5-2 in his last grand slam final appearances.
An exhausted Del Potro began netting easy shots and found himself down an early break in the fourth set.