Career
He reached his highest Association of Tennis Professionals singles ranking of 51 and his highest doubles ranking of 238 on 29 February. Chung took up tennis as a way to try and help maintain his eyesight after requiring glasses at a young age. He began competing on the International Tennis Federation junior tour in 2012, and was runner-up in the 2013 Wimbledon Boys" Singles, a month after winning his first Futures title.
He later competed in his first Association of Tennis Professionals tournament, the Malaysian Open, being defeated in the first round.
2014 2014 saw Chung move full time to the men"s professional game, winning 3 Futures tournaments and the 2014 Bangkok Open, his first Challenger level tournament. 2015: Breakthrough Chung reached the final qualifying round for the Australian Open, but focused his efforts on the Challenger Tour.
Two further Challenger titles followed in April and May 2015, which saw him enter the world top 100 for the first time. His rapid rise up the rankings and an error on behalf of the Korean Tennis Federation meant that he missed the entry deadline for the 2015 French Open.
Although he was later handed a wildcard into the qualifying tournament, he was eliminated in the first round.
Chung then lost in straight sets to an unranked Nicholas Monroe in the first round of qualifiers in the Topshelf Open. In the 2015 Wimbledon Championships, he reached his first main draw in a Grand Slam tournament, losing 10–8 in the decisive set in the first round to Pierre-Hugues Herbert. Chung lost in the second round against fifth seed Stanislas Wawrinka in straight sets, despite taking each set to a tiebreak.
He continued to play on both the Challenger and Association of Tennis Professionals tour through 2015, winning a further Challenger at Kaohsiung in September and reaching his first Association of Tennis Professionals quarter-final at the Shenzhen Open.
He lost in the second round to the 3rd seed Marin Čilić. At Australian Open Chung lost in the first round to Novak Djokovic.
In February, Chung lost in Sofia in the first round to qualifier Marius Copil. In Rotterdam Chung reached second round, where he lost to Viktor Troicki.
In Marseille he lost in the first round to David Goffin.
In Dubai Chung defeated Andreas Seppi in the first round. Then he lost to Roberto Bautista Agut, winning only a single game in this match. In Indian Wells, Chung lost in the first round to Albert Ramos-Viñolas.
Singles Updated through the 2015 Shanghai Masters.
