"You just don't know".
So, we could well see matches starting, stopping and being hampered by gale force winds, which makes betting on Friday's matches tricky.
But with this Roland Garros seeing Djokovic, Rafael Nadal and Roger Federer all in the semifinals at the same Slam for the first time since the 2012 French Open, the Serb was asked if Thiem was the tennis equivalent of Ringo, a role previously filled by the absent Andy Murray.
The world number 51 will be the youngest player to contest a Grand Slam semi-final for 12 years today against eighth seed Ashleigh Barty, after cruising past Halep 6-2, 6-4 in the biggest match of her career so far.
Overall, Nadal and Federer have met on clay 15 times, including the French Open.
Let's take a look at the betting history behind Nadal and Federer's 12 Grand Slam matches dating all the way back to their first showdown in 2005...
Vondrousova saved three set points while trailing 3-5 in the opening set.
"They are all attractive courts".
But the American sprung into life at 5-0, saving two set points to bag her first game.
This time, as Roger Federer prepares to take on Rafael Nadal in the French Open semi-finals, the surface will obviously suit the King of Clay. His last was at the Australian Open in 2018.
Starting next year, Roland Garros will have a retractable roof over the main court to make it the last of the four Grand Slam events to have at least one stadium in which matches can be played in any weather.
"I just played the best tennis of my life". It was the worst loss of Federer's Grand Slam career. And their bodies aren't as resilient as they used to be. Federer has won just two of these matches.
Like so many times before, it was Nadal's topspin-heavy lefty forehand, his relentless ball-chasing and his return game that gave Federer fits. He then lost on clay at the Monte Carlo Masters in April, raising more questions about his knee holding up.
Simon didn't elaborate on what those "other solutions" were, while the French tennis federation responded in a statement that the decision to schedule the semifinals at the same time on the same day was made for "fairness reasons".
"I didn't regret anything I did there", Konta said. Nadal likely operates with a similar mentality, and it's been speculated that he has two or three years left.
With 29 coming into the semifinals, the Australian is tied with Karolina Pliskova for most tour-level wins for a woman this year. Serena Williams, No. 1 Naomi Osaka and No. 2 Karolina Pliskova lost in the third round; Angelique Kerber and Caroline Wozniacki were gone in the first.
"I don't feel like I came into this week trying to prove anything to anybody, including myself". Incredibly, the two generational stars have never met at the US Open.
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