In short:

Veteran coach Francisco Roig has torn his Achilles tendon in a volley session with former world number one Iga Świątek in Rome. 

Świątek says she thought her new coach was joking when he said he had injured himself. 

What's next?

Świątek takes on Elisabetta Cocciaretto in the round of 32 at the Italian Open.

It was supposed to be a fun game between Iga Świątek and her new coach on a special court in downtown Rome to help promote the Italian Open.

It ended with a torn Achilles tendon for Francisco Roig, who was recently hired by Świątek, the six-time grand slam champion.

Świątek recounted that there was a 100 euro ($162) bet on the line for a volleying game, and Świątek had match point when the injury happened.

"He did a split step and tore his Achilles," Świątek said after a three-set victory over American opponent Caty McNally in her opening match on Friday.

"It happened on Saturday. On Tuesday, he had surgery already in Warsaw. We kind of took care of him."

Roig, who formerly coached Rafael Nadal, was hired by Świątek after she parted ways with Wim Fissette.

"He basically just missed one practice," Świątek said.

"It's not easy right now in the practices because he can't be next to me. But we'll make it work."

The practice session was held in the downtown Piazza del Popolo.

"I don't think people noticed how serious it was because he was so brave in the moment," Świątek said. 

"I would burst out crying. I would make such a drama. His face was like normal. I thought he was joking at the beginning. My hitting partner thought he was joking as well."

Świątek is a three-time champion in Rome and is preparing for the French Open, which she has won four times.

So, has the injury helped her bond with her new coach?

"We had a good relationship from the beginning," Świątek said. 

"Didn't need any health issues for that."

AP