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Roger Federer (left), of Switzerland, returns a shot from Feliciano Lopez, of Spain. Rafael Nadal of Spain reacts after his third round match win over Leonardo Mayer of Argentina. Image Credit: AP/AFP

New York: Roger Federer is as curious as tennis fans around the world to see if he will finally play against Rafael Nadal for the first time at the US Open.

But even if not, the two career leaders in men’s Grand Slam titles will have the chance to bond as teammates and possibly even doubles partners later this month in a new Europe versus The World team event.

“Good for a change, yes, after all these years,” Federer said. “If I can help him, great. If he can help me, even better.”

Federer rolled into the fourth round of the US Open on Saturday, extending his bid for a 20th career Grand Slam title by downing Spanish 31st seed Feliciano Lopez 6-3, 6-3, 7-5.

The 36-year-old Swiss third seed, seeking a record sixth title on New York hard courts, could meet world number one Nadal in a Friday semi-final at Arthur Ashe Stadium in the one Slam where they have never played.

“For many years Rafa and me, we’ve tried to play against each other here, and it just didn’t work out,” Federer said. “Now this week, I don’t feel necessarily the pressure’s there.

“I’m happy I’m still around. Rafa fought well through again today. I’m happy for him, too. We’ll see if it gets done or not. I’m curious to see myself.”

Federer is having a banner season after some suspected he might never lift another Grand Slam trophy, taking the Wimbledon and Australian Open crowns.

Nadal has done the same at age 31, winning his 15th Slam title by capturing his record 10th French Open crown while Saturday’s 6-7(3) 6-3 6-1 6-4 third-round win against Argentine Leonardo Mayer showed his staying power.

The long-time rivals will team up on September 22-24 for the Laver Cup in Prague, a new three-day team event pitting Bjorn Borg’s European squad against a World line-up guided by John McEnroe.

Federer and Nadal will work together alongside Austria’s Dominic Thiem, Czech Tomas Berdych, Germany’s Alexander Zverev and Croatia’s Marin Cilic.

“Rafa, he has been such a wonderful champion and a good friend of mine on the tour, one of my big rivals for life, that it’s just nice to be able to spend some time with him and support him,” Federer said.

Federer, who would be the oldest US Open champion in the Open Era (since 1967), was also excited about the chance to spend time with 61-year-old Swedish legend Borg, an 11-time Grand Slam champion who captains the European side.

“For me to spend time with Bjorn, it’s quite rare,” Federer said. “He doesn’t spend so much time on the tour. When he shows up, it’s short. I feel every minute you get with him is a privilege.

“Here we are, he’s going to be stuck with us. So it’s going, I think, to be very special for all of us, particularly me. I mean, I have incredible respect for him.”

Federer said if he could turn back the clock and face one all-time icon from another era, it would be Borg in his prime, when he was winning six French Open and five Wimbledon crowns from 1974 to 1981.

“If I could play one player ever going back, I feel like it would be Bjorn,” Federer said. “I feel he’s that incredibly good, for what he did for the game. If I look how he played, what he brought to it, it’s crazy.”

Nadal, the world number one, needed to wait for his 14th opportunity to break his opponent but by that time Mayer had taken the first set by winning the tiebreak.

“Of course, you are under stress when you see that you have opportunities almost in every game, and you are not able to convert them,” said Nadal. “At the beginning you get nerves when you don’t convert opportunities.” Once he broke to lead 3-2 in the second set, Nadal appeared to be free of his early jitters and took hold of the match.

“When finally I did it, everything changed. I was able to play more freely, to start to attack better with my forehand,” said the Spaniard, who hit only 13 unforced errors in the last three sets, having made 13 in the opening set.

“I had more forehands down the line, hitting some good backhands later. I think the level of tennis after that break have been very positive.” Nadal, who is chasing a second grand slam title this year after claiming a record-extending 10th French Open title in June, is growing more confident ahead of his clash with Ukraine’s Alexandr Dolgopolov.

US Open men’s singles

(Last 16 line-up)

Rafael Nadal (ESP x1) v Alexandr Dolgopolov (UKR)

David Goffin (BEL x9) v Andrey Rublev (RUS)

Roger Federer (SUI x3) v Philipp Kohlschreiber (GER x33)

Juan Martin del Potro (ARG x24) v Dominic Thiem (AUT x6)

Sam Querrey (USA x17) v Mischa Zverev (GER x23)

Paolo Lorenzi (ITA) v Kevin Anderson (RSA x28)

Denis Shapovalov (CAN) v Pablo Carreqo-Busta (ESP x12)

Lucas Pouille (FRA x16) v Diego Schwartzman (ARG)