Chung moved up two spots to reach No. 47 in the Association of Tennis Professionals world rankings released Monday.
Two weeks ago, Chung cracked the top 50 for the first time by soaring seven slots to No. 49.
|In this Associated Press file photo taken on Aug. 14, 2017, Chung Hyeon of South Korea returns a shot against Feliciano Lopez during the first round at the Western & Southern Open on the Association of Tennis Professionals Tour in Mason, Ohio. (Yonhap)|
Chung reached the quarterfinals at last week's ATP event, the Winston-Salem Open, in North Carolina.
Chung is scheduled to compete at the US Open, the final Grand Slam tournament of the year, this week.
Retired player Lee Hyung-taik owns the record for the highest-ranking position by a South Korean player at No. 36, attained in August 2007. (Yonhap)