S. Korean sensation Heon Chung said in a news conference after the match against Tennys Sandgren "I know it is not over yet."
Hyeon Chung has reached the semifinals of a Grand Slam event for the first time, following up his upset victory over six-time Australian Open champion Novak Djokovic in the fourth round with a 6-4, 7-6 (5), 6-3 win over Tennys Sandgren on Wednesday.
In the women's draw, top-seeded Simona Halep of Romania defeated No. 6-seeded Karolina Pliskova of the Czech Republic 6-3, 6-2, and will play in the semifinals against Angelique Kerber of Germany, who defeated Madison Keys of the U.S. 6-1, 6-2.
The No. 58-ranked Chung is the first Korean player to reach the semifinals of a major, and the lowest-ranked man to reach the Australian Open semifinals since Marat Safin in 2004.
After taking out No. 4 Alexander Zverev and 12-time major winner Djokovic in consecutive rounds, Chung could next face defending champion Roger Federer for a spot in the final. Federer was playing Tomas Berdych later Wednesday in the quarterfinals.
Chung, 21, missed four match points in the final game and had to fend off two break points as the pressure increased.
"In last game, I'm thinking to start what I had to do in ceremony or something like that," he said, explaining how he got slightly ahead of himself. "After deuce, break point. Nothing to do with ceremony. Just keep focused."
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