"No-one can believe that a tournament such as Roland Garros can do this, it cannot be like this", he told Spanish radio station Cadena Ser on Tuesday.
Sixth seed Williams will next face Bulgarian Tsvetana Pironkova in a rematch of their U.S. Open quarter-final, which the American won over three sets earlier this month.
The temperature on Court Philippe Chatrier dropped as low as 13 degrees Celsius (55 degrees Fahrenheit).
Daniil Medvedev is now 0-4 for his career at the French Open as runner-up at the U.S. Open a year ago and a semifinalist in NY last month failed yet again to win a match at Roland Garros.
Nadal, 34, needs one more Slam to match Roger Federer's record but has described the defence of his Roland Garros crown as the "most hard ever" given the cold and damp conditions of a tournament delayed four months by the coronavirus pandemic. I love the conditions because I am from Austria.
It proved to be an unhappy 32nd birthday for Cilic, who took the match to Thiem but paid the price for too many unforced errors in a 6-4 6-3 6-3 defeat.
- No.3 seed Elina Svitolina, a champion at the WTA event in Strasbourg last week, following her 7-6 (2) 6-4 first-round win over Varvara Gracheva.
Mladenovic was 5-1 up and with a set point against Laura Siegemund when the German scooped a victor despite the ball appearing to bounce twice.
Malta U-turn: Prince George can keep his shark tooth fossil
After meeting in the grounds of Kensington Palace, Sir David told The Times that it was a "very nice domestic occasion". Herrera continued, saying: "We rightly give a lot of attention to historical and artistic artefacts".
Bertens will next face 2012 finalist Sara Errani, who had to come through qualifying before claiming a 6-2 6-1 opening-round win over Puerto Rican Monica Puig. He saved one but was broken when he hit wide down the line. He received treatment on his right foot after an awkward fall. But in general terms, that's a normal first match of Roland Garros, no?
Spanish tennis player Fernando Verdasco has announced his intention to sue the French Open organisers after he was forced to withdraw from the tournament due to a positive coronavirus test which he insists was not accurate.
The 33-year-old top seed is in the second round for a record-equalling 16th time, matching Guillermo Vilas and Nadal.
Sandgren was a point from losing when he served at 15-40 while trailing 8-7 in the fifth.
"It's one of my biggest wins, tonight". Sandgren then needed four match points of his own to close things.
Fognini lost 7-5, 3-6, 7-6 (1), 6-0 to Mikhail Kukushkin and Auger-Aliassime was beaten 7-5, 6-3, 6-3 by Yoshihito Nishioka.
Serena Williams takes on Tsvetana Pironkova in Chatrier in a rematch of the 23-time Grand Slam champions quarterfinal victory at Flushing Meadows, while No. 1 seed Simona Halep plays Irina-Camelia Begu in Lenglen.
Gerasimov showed impressive athleticism for a man of his 6ft 5in frame but could not find his range when it mattered, and he fired a forehand long to hand Nadal the second set.