“Obviously it’s not the greatest thing to hear,” Kyrgios said of the jeers. “I didn’t have the best preparation coming into the Australian Open. Pretty banged up, my body. I don’t even know what the score was in the end. Was it 10-8? 10-8 in the fifth, getting booed off, definitely not the best feeling.”

“I’m fit,” Kerber said. “I am prepared for playing, like, two, three hours, so that’s not a problem. Tomorrow I have a day off, so it’s not a big deal. I think I will be fine.”