Organizers had discussed several measures to hold the annual event in a safe manner, such as staging only the full 42km race and not the shorter distances, reducing the number of participants and having all participants undertake a COVID-19 test before the race, explained a SEGAS statement.
"Of course, I will make sure I don't make the same mistake twice," he added.
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.
The former world No. 1 is to face a tougher challenge in the second round against 2017 champion Jelena Ostapenko of Latvia, who knocked out American Madison Brengle 6-2, 6-1.
The first game of the day saw Alaves draw 0-0 at home to Getafe in a game where the first half was more open than the second. Enditem
The runners-up, a joint team from Liaoning and Sichuan, finished in 3:53.12, and Guangdong took the third place in 3:53.39. Enditem
The swimmers' performances at the championships will act as an important reference for their qualification for next year's Tokyo Olympic Games. Enditem
Ranking fourth in the preliminary heat, Olympic champion Ye Shiwen failed to advance to the final of the women's 400m individual medley, as she failed to make the top eight in the physical tests, according to a new rule of the championships.
There was controversy before the race had even started, as it emerged that Hamilton was under investigation for making two practise starts outside the permitted area of the pit lane on his way to the starting grid.
The defender was then shown a direct red card in the 67th minute on the instruction of VAR for bringing down Luka Jovic when the striker looked to be through on goal.
Brazil's Gremio also secured their place in the tournament's next phase on Tuesday, with a 2-0 home win over Chilean side Universidad Catolica. Pepe and Antonio Rodrigues were on the scoresheet for the Porto Alegre outfit.