Teenager Lin Chun-Yi stunned the field at the YONEX US Open 2019, clinching the men’s singles title yesterday in his first final of this level.

The 19-year-old started out the qualifying rounds before completing a series of upsets to win his first senior title. He beat Brazil’s Ygor Coelho in the opening round and Canada Open winner Li Shi Feng in the second.

Korean veteran Lee Dong Keun, the top seed, was next to fall; Lin then beat compatriot Lin Yu Hsien in three games in the semifinals. The title bout saw him face experienced Thai Tanongsak Saensomboonsuk, whom he steamrolled 21-10 21-13.

Lin’s previous appearances in a final were at the Finnish Open in April, when he was beaten by Thailand’s Kunlavut Vitidsarn, and at the Sydney International in 2017, which he won.

The women’s singles title too was won by a qualifier, Wang Zhi Yi. The 19-year-old Chinese, who was runner-up at the Canada Open, got the better of Korea’s Kim Ga Eun in the final, 21-18 21-19.

Earlier, Wang had made her way past second seed Saena Kawakami (Japan) in the second round, and the sixth seed Ayumi Mine, also Japan, in the semifinals.

Canada Open champion An Se Young was stopped 21-11 21-14 in the quarterfinals by compatriot Kim Ga Eun, who went on to beat top seed Michelle Li in the last-four, 21-16 21-8.

The final day’s proceedings began with Chinese Taipei’s Lee Jhe-Huei and Hsu Ya Ching achieving their best result this year in their first season as a pair. The qualifiers, who were in the semifinals of the Canada Open, surprised a strong field. They beat sixth seeds Ronan Labar/Anne Tran in the second round, followed by a thrilling 21-13 18-21 21-16 result over Canada Open champion Ko Sung Hyun/Eom Hye Won in the quarterfinals.

The Chinese Taipei duo survived two match points in the semi-finals against England’s Ben Lane/Jessica Pugh, before scoring a more comfortable win over French pair Thom Gicquel/Delphine Delrue in the final, 21-17 21-17.

After the first three finals were won by qualifiers, the women’s doubles final went by seeding, with top seeds Nami Matsuyama/Chiharu Shida triumphant over fifth seeds Baek Ha Na/Jung Kyung Eun, 21-16 21-16.

This was the Japanese’s first title since the Chinese Taipei Open last October. Since then, they finished second-best in two finals – Barcelona Spain Masters and Swiss Open.

The Japanese were mostly untroubled through the week, with only the semifinal, against China’s Chen Xiao Fei/Zhang Shu Xian, costing them a game.

Mixed doubles sixth seeds Ko Sung Hyun/Shin Baek Cheol (Korea) wrapped up the final day’s session earlier than expected, as their opponents Lee Yang/Wang Chi-Lin retired early in the third game with the score at 21-13 17-21 6-3.

This was the third title this year for the 2014 world champions after the Osaka International Challenge and the Australian Open.

Ko and Shin had to endure a difficult week, as they were taken to three games in every round. They survived a match point against Japan’s Akira Koga/Taichi Saito in the second round, and went on to beat Lu Ching Yao/Yang Po Han (Chinese Taipei) and Hiroki Okamura/Masayuki Onodera (Japan), both in three games, on the way to the final.