Nadal clinched his 16th major title after winning the US Open crown for a third time with a straight sets win over Kevin Anderson at Flushing Meadows.
The Spaniard now finds himself just three behind arch rival Federer, who has claimed 19 slams – with his latest coming at this year’s Wimbledon.
However, Courier reckons Nadal, who has suffered with injury setbacks in the past, has a shot of catching the Swiss maestro should he stay healthy.
He also reckons Novak Djokovic, who has won 12 majors, is in with a shout of making history too.
“It could be 18-17 right now and if Nadal stays healthy, he’s going to have significantly more opportunities than Federer just because of the age gap,” Courier told the Tennis Channel.

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“Who’s going to bet against Nadal winning a couple more French Opens if he’s in good health?
“Not me. That’s for sure.
“This is a story that’s still ongoing, they’re very much in motion.
“One of the big questions for 2018 is which Novak Djokovic shows up. Hopefully he’ll be healthy. He could very likely get himself back in the mix as well.
“So it’s exciting and nobody saw this year coming, did they?
“I mean who saw Roger and Rafa sweeping the four majors?!”