COVID-19 positive

Medical experts are investigating whether the disease could have been passed on through the mother's placenta during pregnancy.

Two of the babies, one boy and one girl, are in a stable condition in a hospital in San Luis Potosí state.

But the second boy is receiving treatment for a respiratory condition.

A spokesperson for the state's Health Safety Committee said contagion in multiple births had not been detected anywhere globally and so the case would be investigated.

The Bulgarian, 29, withdrew from the second tournament in Zadar, Croatia on Saturday with sickness after his opening loss to Borna Coric.

"I am so sorry for any harm I might have caused," he said.

Sunday's final, which would have featured world number one Djokovic, has been cancelled.

Dimitrov, who also played in the first event in Belgrade last week, wrote on Instagram: "I tested positive back in Monaco for Covid-19. I want to make sure anyone who has been in contact with me during these past days gets tested and takes the necessary precautions.

Football team Nagoya Grampus announced that forward Mu Kanazaki tested positive for the virus, less than a week after the J.League announced plans to restart the campaign on July 4, albeit without fans in stadiums, and as many clubs returned to full training.

Later on Wednesday, the Tokyo-based Nippon Professional Baseball (NPB) team Yomuiri Giants announced that two players, shortstop Hayato Sakamoto and catcher Takumi Oshiro, had also tested positive.

The Giants' scheduled pre-season game against the Seibu Lions on Wednesday was cancelled.