Saina Nehwal (women's singles) and Kidambi Srikanth (men's singles) had earlier won the India Open Superseries badminton title.
Winner PV Sindhu with runner-up Carolina Marin of Spain.
"It is always hard to play Sung Ji as she is a kind of player against whom you have to construct points as she would not give away easy points".
The third seed took 36 minutes to floor Chou 21-13, 21-10 to claim his maiden India Open title. Her bodyline shots on Sindhu seemed to be a pre-game tactic and it rattled Sindhu throughout the match. "These matches give them a lot of confidence and they are developing very well".
Last August in Rio, the scene was completely reverse - Sindhu had looked frustrated as Marin lay on her back in the court to enjoy the golden moment.
Sindhu, the world No 5, weathered a fightback from Sung, the world No 4, before winning 21-14 18-21 21-14 to the cheers of a packed audience at the Siri Fort auditorium. While, SIndhu, considering her recent form, will start the clash as favourite, Marin, with her never-say-die attitude, can be risky. Talking to the media after the match, Sindhu said the first game had been integral for her in the final.
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The four-time PGA Tour victor - who is gearing up for the upcoming Masters - teed off on the back nine and opened with a birdie. Fowler said he was fortunate to not have been too thrown off by the muddy conditions.
This was the second meeting between Sindhu and Marin after the Rio Olympics in August past year where the Spaniard defeated the fifth-ranked Indian 21-19, 12-21, 15-21 in a thrilling contest to win the Gold medal. But Sindhu also had to be credited for showing her ever-improving game, especially in the cross-court net-game and defence. She might know my game and I might know hers, we both will have this feeling that we won against each other.
In front of a partisan home crowd at the Sirifort Sports Complex, the third seeded Indian dominated the match from the start to win the summit clash in 46 minutes. The Korean tried to engage Sindhu in rallies but the Indian always produced a power-packed stroke to finish the rallies and kept her three-point lead till 19-16.
Just like the opening game, Marin quietly clawed her way back into the game to reduce the margin to 6-7.
The mixed doubles title went to Lu Kai and Huang Yaqiong of China after the beat their compatriots Zheng Siwei and Chen Qingchen 22-24, 21-14, 21-17.
This brings up a repeat of last year's men's doubles final and Marcus Fernaldi Gideon / Kevin Sanjaya Sukamuljo have beaten Suwardi/Pratama twice since then.