He is also assured of keeping his number one ranking for good measure.
For 24-year-old Thiem, playing in his first Grand Slam final, it was a deflating defeat for the only man to have beaten the Spaniard on clay in the last two years.
Since 2002, the tennis player who won 20 tournaments of "Grand slam" and headed the world ranking for 309 weeks, has collaborated with American brand Nike.
While to many the Swiss maestro has earned the right to choose his schedule as he approaches his 37th birthday, Wilander maintains he should be in Paris. That was part of a five-game run that sent Nadal on his way.
"Number one, to win my first round". How much can that dent your confidence?
Roger Federer admits "it's great to be back" as the Swiss great returns to the tennis scene in Stuttgart after missing the entire clay-court season.
"It's a dream to win 11 times", Nadal said. "No words can express what we feel about Rafa's game and what he has done for the game of tennis on a worldwide basis".
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Nadal beats del Porto, advances to final
Open, two at Wimbledon and one at the Australian Open, and Nadal is up to 17 majors, second among men only to Roger Federer's 20. Del Potro, the US Open victor in 2009, is playing the tournament for only the second time since 2012 after a spate of injuries.
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Nadal's career title count, which is now fourth on the all-time list, behind Jimmy Connors (109), Federer (97), and Ivan Lendl (94), and ahead of John McEnroe (77), whose tally he equalled and then surpassed with titles this year in Barcelona and Rome, respectively.
From a sartorial standpoint, it was a good championship weekend for players wearing Nike as three of the four singles finalists represented the swoosh.
"It's not a criticism but it's a shame".
Only Nadal, Pete Sampras and Ken Rosewall have managed the feat of winning Grand Slam titles in their teens, 20s and 30s. I am not much anxious about the future.
"He said it's about being competitive". I played this tournament many times when I wasn't competitive but I still came to compete. He pounded huge serves that topped 135 miles per hour (220 kph) - about 25 miles per hour (40 kph) better than Nadal's fastest - and translated into seven aces but also had five double-faults.
If he did take a step in that direction, you would think, he would wear their clothing for the first time at Wimbledon next month.
Roger Federer hasn't played a competitive match since March, and he's itching to get back on court. "I don't blame him but would have loved to see him here". If he wins the title he can break his own Open Era record of 36 consecutive sets won on grass set in 2003-04... "Of course, because he's not here!"