However, the match will now be a walkover for the Australian.
He told reporters at an impromptu press conference: “Good evening. I have to pull out of the tournament.
“As everybody saw yesterday I have been suffering with the pain in the abdominal [area]. That’s confirmed. I have a tear in the muscle.
“I have a tear in the abdominal, the muscle. I was thinking about the whole day about the decision. But it doesn’t make sense to keep going. If I keep going the injury will get worse and worse. I feel very sad to say that.
“I don’t want to go out there and not be competitive and with a big chance to make things worse.
“Everybody knows what effort I put in to be here. I can’t risk that much and [then spend] two, three months out of the competition.”
The injury ends Nadal’s hopes of a calendar Grand Slam, after winning the Australian and French Opens in spectacular style.