Cori ‘Coco’ Gauff can be grand slam champion if she stays hungry, says Li Na

MELBOURNE, AUSTRALIA - JANUARY 20: Na Li of China poses at the Blackmores Wellbeing Oasis during day three of the 2016 Australian Open at Melbourne Park on January 20, 2016 in Melbourne, Australia. (Photo by Graham Denholm/Getty Images)

NEW YORK, NEW YORK - SEPTEMBER 12: Daniil Medvedev of Russia celebrates with the championship trophy after defeating Novak Djokovic of Serbia to win the Men's Singles final match on Day Fourteen of the 2021 US Open at the USTA Billie Jean King National Tennis Center on September 12, 2021 in the Flushing neighborhood of the Queens borough of New York City. (Photo by Matthew Stockman/Getty Images)

Emma Raducanu, of Britain, holds up the US Open championship trophy after defeating Leylah Fernandez, of Canada, during the women's singles final of the US Open tennis championships, Saturday, Sept. 11, 2021, in New York. (AP Photo/Seth Wenig)

Russia's Daniil Medvedev hits a return to France's Richard Gasquet during their 2021 US Open Tennis tournament men's singles first round match at the USTA Billie Jean King National Tennis Center in New York, on August 30, 2021. (Photo by Ed JONES / AFP) (Photo by ED JONES/AFP via Getty Images)

LONDON, ENGLAND - JULY 05: Coco Gauff of The United States stretches to play a forehand in her Ladies' Singles Fourth Round match against Angelique Kerber of Germany during Day Seven of The Championships - Wimbledon 2021 at All England Lawn Tennis and Croquet Club on July 05, 2021 in London, England. (Photo by Julian Finney/Getty Images)

PARIS, FRANCE - JUNE 01: Ashleigh Barty of Australia plays a forehand in their ladies first round match against Bernarda Pera of The United States during day three of the 2021 French Open at Roland Garros on June 01, 2021 in Paris, France. (Photo by Adam Pretty/Getty Images)

NEW YORK, NY - SEPTEMBER 08: Naomi Osaka of Japan after winning the Women's Singles finals match alongside runner up Serena Williams of the United States on Day Thirteen of the 2018 US Open at the USTA Billie Jean King National Tennis Center on September 8, 2018 in the Flushing neighborhood of the Queens borough of New York City. (Photo by Julian Finney/Getty Images)

MELBOURNE, AUSTRALIA - JANUARY 21: Patrick McEnroe of the United States plays a forehand in his Men's Legends match with and John McEnroe of the United States against Henri Leconte of France and Todd Woodbridge of Australia during day eight of the 2019 Australian Open at Melbourne Park on January 21, 2019 in Melbourne, Australia. (Photo by Scott Barbour/Getty Images)

Naomi Osaka of Japan poses with the trophy after beating Australia's Ashleigh Barty in the final of the China Open in Beijing.