Koo challenges Sze Fei-Izzuddin and Aaron-Wooi Yik to go for world No. 1 spot
PETALING JAYA: Former doubles shuttler Koo Kien Keat has challenged current pairs Goh Sze Fei-Nur Izzuddin Rumsani and Aaron Chia-Soh Wooi Yik to reign as the world No. 1 pair.

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