Toni Nadal is confident in his nephew's abilities—really confident. Speaking on a Spanish radio station, Rafael Nadal's uncle suggested that Rafael Nadal will definitely reach the Roger Federer's record 19 Grand Slams.

"We will get to Federer’s 19, yes...I think it will happen," he said. "It’s difficult, but there is some more Roland Garros and I am confident other titles will come."

"When he was 12, 13 or 14, you never think he will get to this level," Toni Nadal added. "We are very happy that he has won another Grand Slam, his 16th, and is in a position to fight for No. 1.

"It was unimaginable that would happen, of course. But I had faith that Rafael would win one more Grand Slam, I tell you truthfully."

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Rafael Nadal is taking some time off from the tour to prep for the final leg of the season. He's currently ranked No. 1 in the world, and will want to keep that No. 1 seeding at the ATP World Tour Finals in London. He has yet to win a year-end championship title.