Nadal and Del Potro can serve up power-packed semi-final

Kevin Anderson of South Africa reacts after giving up a point to Rafael Nadal of Spain during the men's singles final of the U.S. Open tennis tournament Sunday Sept. 10 2017 in New York

Many are tipping this match to be the US Open 2017 the victor of this enters the all-important match at the Flushing Meadows on Sunday as huge favourites.

"The way I played or playing right now, it's not good enough in my opinion to win this tournament". After the Spaniard defeated Andrey Rublev, it seemed virtually nailed on that NY would witness a first meeting between the great beasts of men's tennis in the semi-finals. He had support Wednesday with the upper deck singing "Ole" across the match-turning, third-set tiebreaker in which the Argentine fought off four sets points. "It's nine months after thinking I would need to undergo a year's worth of rehab after surgery, so this means the world to me".

For 36-year-old Federer, it was a first Slam loss of 2017 after he had captured the Australian Open and Wimbledon titles to take his career tally to 19."I served really good". So you appreciate it. I am very happy to be in the final here in the US Open.

South African Anderson, 31, beat Pablo Carreno Busta of Spain 4-6 7-5 6-3 6-4 earlier on Arthur Ashe Stadium.

After the pair split the first two sets with a break apiece, the match turned on a gripping third-set tie-break in which Federer saw four set points slip by. The Spaniard is yet to drop a set this tournament, so he deserves his spot in his first ever major semi-final.

Well, as it turns out, he'll face the 24th-seeded del Potro today.

"I was playing too much to his backhand and I knew that I had to change and move him more and be more unpredictable".

This is the 23rd Grand Final of Nadal's career. It was put down to the possibility of Federer not having fully recovered from the back injury that forced him to miss the Cincinnati Masters prior to the US Open.

If there was one tournament where are the favorites were constant it was the one at Flushing Meadows.

At stake is a championship match against the victor of a semi-final which is a throwback to before the "Big Four" era, which regularly provided some less than stellar finalists.

Del Potro dominated the first set as he sought to defeat Nadal just as he did at the same stage of the tournament in 2009 before going on to beat Roger Federer in the final for his only title at the majors. Carreno Busta battled gamely in the fourth set, holding serve in a hard-fought ninth game to trim Anderson's lead to 5-4 but Anderson served for the match and clinched the berth in the final when Carreno Busta hit a forehand into the net.

The women's event has already delivered one big surprise, with all four of Thursday night's semi-finalists coming from the host nation.

- Top seeds Martina Hingis and Jamie Murray saved three set points to record a 6-4 7-6 (8) victory over CoCo Vandeweghe and Horia Tecau in the mixed doubles semi-finals.