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Nadal prevails to secure quarter-final with Thiem

Nadal prevails to secure quarter-final with Thiem

"Two matches in the row that were very tough ones", said Nadal, who had to battle back against Russian Karen Khachanov two days ago. But the 24-year-old Austrian served almost perfectly and gave the 6-foot-8-inch South African little time to unleash his mammoth groundstrokes.

In the fourth set, Thiem once again took control early, breaking Nadal to take a 2-1 lead.

But Basilashvili stunned Nadal in the third set tiebreak and even retrieved a break for 3-3 in the fourth before Nadal s greater composure paid off. His opponent will be No. 1 seed Rafael Nadal, who needed four sets to bounce Nikoloz Basilashvili.

Meanwhile, Serena Williams survived a scare from giant-killer Kaia Kanepi to claim a roller-coaster 6-0, 4-6, 6-3 win and move a step closer to a record-equalling 24th career Grand Slam title.

Third-seeded Del Potro made the last eight for the sixth time.

John Isner ground out yet another five-set win at the U.S. Open beating Milos Raonic 3-6 6-3 6-4 3-6 6-2 to advance to the quarter-finals of his home Grand Slam for the second time. It has been another magnificent season for Nadal, highlighted by an 11th French Open and Masters titles in Monte Carlo, Rome and Toronto.

Nadal seemed to be on the verge of cracking the code when he broke back in the fourth and came within two points of winning the match.

Nadal has beaten Thiem three times at the French Open and seven times in 10 meetings - all on clay. This set lasted 67 minutes but the real drama was just around the corner in set number four, with 12 break points in total and more than 80 minutes required to be completed!

"Against Rafa, I ve had three very nice experiences and seven disgusting experiences", said 24-year-old Thiem.

Thiem will next play either world number one Rafael Nadal, who beat Nikoloz Basilashvili in another pre-quarterfinal. "I hope that it s a little bit more comfortable on hard court, but I m not sure".

Nadal said he will need to raise his game to get past the red-hot Dominic Thiem, who reached his first U.S. Open quarter-finals.

"To play John in these kind of matches, it's like an epic". He was agonizingly close to getting there past year at the U.S. Open, leading by two sets against Juan Martin del Potro in the round of 16 before the 2009 champion roared back to win.

In addition the Austrian found the slower conditions of the new Louis Armstrong Stadium much to his liking, reminiscent he said afterwards of clay, which is his favourite surface.

Isner, the 11th seed, is attempting to become the first home victor since Andy Roddick in 2003. The Mallorcan lost in the Melbourne quarters, won Roland Garros for an 11th time, and fell to Novak Djokovic in the Wimbledon semis this year.

He is 1-1 against Coric.

"He played fantastic. A lot of credit to him". But why not me? They'll try it for the first time in the U.S. Open quarterfinals at Billie Jean King National Tennis Center on Tuesday and see how it goes.

The 33-year-old Isner is the tournament leader in aces and was nailing them against Raonic with 140 miles per hour serves.