Seventh seed Petra Kvitova of the Czech Republic is also through after she overcame Jasmine Paolini of Italy 6-3, 6-3.
"I really wanted to give an effort here. It's my Achilles that didn't have enough to properly heal after the [US] Open. I was able to get it somewhat better, but just looking long-term in this tournament, will I be able to get through enough matches? For me, I don't think I could," said the three-time Roland Garros champion.
Earlier in the day, Czech Karolina Pliskova survived a scare from Egyptian qualifier Mayar Sherif after she came back from one set down to beat her opponent 6-7(9), 6-2, 6-4 to reach the second round.
"This is the first major tournament in the last 11 months because of the epidemic. I know I can swim faster this time and want to see how fast I could be," said the bronze medalist of the world championships.
Real Sociedad ruined Elche's return to the top flight as they won 3-0 in Elche's Martin Valero stadium with second half goals from Portu, Adnan Januzaj and Roberto Lopez.
Qin Haiyang from Shanghai, who finished second in the preliminary final of the 400m event, missed the final, after he failed to make the top eight in a selection of physical tests, according to a new requirement of the championships.
"The COVID-19 pandemic brought unprecedented challenges to all industries," said Luo Jie, vice president of the China Sporting Goods Federation. "Thanks to the effort of the whole country, the virus was effectively controlled, and we finally made the show happen."
"Our young players have got increasingly more opportunities which is reflected by an increase of playing time and goals," said Dong Zheng, general manager of CSL.
Olimpia is the most successful club in Paraguayan football, having won the country's first division title a record 44 times and the Copa Libertadores three times. Enditem
Gould scored 107 to tie the game up at 7-7 and was calm enough to win the 18th frame, forcing Selby to seal the win in the deciding frame.
All eyes were on Messi after a summer in which he had asked to leave the club and only two days after he had criticized the departure of Luis Suarez, but Fati was the star of the show.