2015 WTTC in Suzhou, China was the second to last World Championships Joo Saehyuk had played, and this was the last time he participated in single events. In men's singles matches, he passed Tamás Lakatos of Hungary 4-2, defeated Daniel Habesohn of Austria 4-0, and beated Liam Pitchford of Great Britain 4-1. He finally lost to Ma Long of China 1-4 in the fourth round.
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