Should that rematch come off, Chung already has his mission statement in mind: have fun. "Just now I'm very disappointed".
It is his best start to the season since 2006.
The Swiss is unbeaten in 2018, having won 15 matches and claimed titles at the Australian Open and Rotterdam Open. Federer went on to win a five-set final against Marin Cilic for his 20th Grand Slam title.
Federer advances to the quarter-finals where he will face South Korea's Chung Hyeon who defeated 30th seeded Pablo Cuevas 6-1, 6-3 earlier on Wednesday.
Since his Grand Slam breakthrough Down Under, Chung has been on a roll.
Chung charged into his fifth quarterfinal in six tournaments this year. He was a fine player with a ️nice career before he started coaching.
The Korean's compact two-handed backhand, baseline precision, speed and leg strength that prompted ESPN analyst Brad Gilbert to nickname him "Quadzilla" were all on display when he knocked off No. 4-seeded Alexander Zverev and six-time champion Novak Djokovic to reach the Australian Open semifinals. For so many years I have felt good actually in Australia. "But I think we played really good tennis for most of the match".
Against Federer, Chardy played a tough first set in windy conditions that persisted throughout the day.
He dominated Cuevas to take a 6-1, 5-0 lead, before the Uruguayan, ranked 34th, battled back to break Chung twice and make it 5-3. His forehand pulled Chardy completely off the court and Federer hit a crosscourt backhand victor off Chardy's return. Federer has won 15 straight matches on hard court. In the victory, Chung won 73 percent of his first serve points and 54 percent of his second serve points. Cuevas then broke Chung again to close to 5-3, but the Korean closed out the win.
Federer says he sees great things from Chung, who excels in the areas of consistency and quickness. "I have few match points but start [getting] windy and he playing good".
World No 1 Simona Halep punched her ticket to the Indian Wells semi-finals with a 6-4, 6-7 (5/7), 6-3 win over Croatia's Petra Martic on Wednesday.