Racket sponsor Head has issued a premature congratulations to Novak Djokovic for his victory in the Australian Open final.
Head sent out an email congratulating Djokovic on a "record-breaking" ninth Australian Open title, two days before he is due to meet Russia's Daniil Medvedev in the Grand Slam final.
American tennis writer Ben Rothenberg pointed out the error on social media and received responses showing Head had acknowledged the mistake.
"What we meant to say is... good luck Novak in the 2021 Australian Open final," the correction email read.
Head previously caused controversy in 2016 when it stood by tennis star Maria Sharapova, despite the Russian receiving a two-year doping ban for taking the banned substance meldonium.
The racket manufacturer continually claimed Sharapova was a "role model and woman of integrity".
World number one and Australian Open defending champion Djokovic is set to compete for his 18th Grand Slam title tomorrow at Rod Laver Arena.
Medvedev is confident about his own chances and attempted to heap the pressure on Djokovic going into the final.
"I think he's the favourite because he didn't lose," the world number four said.
"In eight occasions that he was here in the semis, he won the tournament.
"Me... I don't know how you call it in English, not an outsider, but I'm the challenger, the guy that challenges the guy who was eight times in the final and won eight times.
"And I'm happy about it.
"I think if we talk in general - I have nothing to lose."
Japan's Naomi Osaka defeated Jennifer Brady of the United States in the women's final today to earn her second Australian Open title.