For Toni Nadal, who stopped coaching his nephew at the end of last season, the experience wasn't that different.
While we have an edge here, I appreciate that backing a heavy odds-on shot isn't most people's cup of tea, so the game handicap should be a viable proposition.
That began a run of four consecutive French Open triumphs through 2008. That did not prevent his uncle from delivering some tactical advice ahead of the final.
"He managed to do it well".
"I've never been insane about this kind of stuff".
When asked if he will defend the title next year, he said: "It was unbelievable to win for the 10th time, same thing for the 11th".
And Rosewall was right in the thick of it to commemorate his 1968 victory - the historic first grand slam of the Open Era.
Nadal, in an on-court interview, also said he's sure that runner-up Thiem will win the tournament in "the next couple of years".
Key statistics: First serve percentage - Nadal 65%, Thiem 45%. I was very scared but that's sport - it was very humid. He pounded huge serves, topping 135 miles per hour (220 kph) about 25 miles per hour (40 kph) more than Nadal's fastest - and that translated into seven aces, but also five double-faults.
Overall, the 32-year-old has won 17 Grand Slam championships - the four most important tennis events held annually in France, United States, Britain and Australia.
We picked up a victor in Friday's semi-final with Rafa Nadal comprehensively thrashing Juan Martin Del Potro, to cover the -6.5 game handicap easily.
Nadal is now up to 17 Grand Slam titles, second all time to Roger Federer.
There was a look of relief on her face when she was on court the moment she won the match, but she doesn't feel like a weight has been lifted off her shoulder.
In 2017 tennis went back to the future.
A trainer was called and he briefly inspected Nadal's left wrist. He then had his forearm massaged at the changeover before resuming his demolition job.
He broke the Austrian in the third game of the set.
In a 10-minute second game of the second set, Thiem suffered more trauma.
Nadal won the first set 6-4.
Thiem used to hike through the Alps in his homeland as part of his training, but the 24-year-old had an even bigger mountain to climb now. Again, Nadal finished the tournament without having dropped a set.
Thiem is contesting his first Grand Slam final.
But against Thiem, there was nothing wrong with Nadal's start.
Nadal had 12 unforced errors.
Perhaps. But under so much pressure from Nadal all afternoon, Thiem made mistakes that piled up.
But he could not match Nadal's point-by-point consistency and intensity on Sunday. He bagged the second set when Thiem sent a backhand long.
Yet Nadal also knows he could be a threat after playing impressively previous year before falling in the last 16, losing a classic tussle against Luxembourg's Gilles Muller. The Austrian had trouble with the Nadal serve, and he gave up an easy hold.
The crowd cheered when Zidane was shown on the big screen. He converted the second to make the score 2-1.
The only man with more titles at a single major is Nadal in Paris.
Roland Garros is undergoing a major modernization project, as have Wimbledon and Flushing Meadows, the venue of the U.S. Open. Now, six Slams later, Federer still keeps his lead at three.
They knocked out the top-seeded pair of Timea Babos and Kristina Mladenovic in the quarterfinals.
Thiem was considered the stiffest test for Nadal at the French Open and understandably so.
Became the first man with eight titles at the same Grand Slam when he beat fellow Spaniard David Ferrer in the 2013 final at Roland Garros.