The 21-year-old South Korean, who beat six-times champion Novak Djokovic in the fourth round at Melbourne Park, has climbed from 58th to 29th in the world, the highest ranking achieved by a Korean player.
Bulgarian world number four Grigor Dimitrov faces a race against time to get fit to defend his title in Sofia after shoulder pain and exhaustion prevented him from practising.
News that makes sense
Your trusted source for staying up-to-date with the world around you. Get free daily news updates and analysis, straight to your inbox.
(Reporting by Angel Krasimirov, editing by Ed Osmond)
Share
