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    vs.      
Kok Seng Ong is tied in the series against Tsutomu Yamada, 1-1.

event round table player one result player two
Grand Prix Kuala Lumpur 20021023Ong, Kok Seng (1559)Won 2-0Yamada, Tsutomu (1587)
Grand Prix Singapore 20051012Ong, Kok Seng (1724)Lost 1-2Yamada, Tsutomu (1690)