TOP SEED Jana Diaz thwarted Chloe Mercado, 6-3, 6-4, while No. 2 Kendrick Bona halted third ranked Lexious Cruz, 6-3, 6-1, as they ruled the 16-under division of the Palawan Pawnshop-Palawan Express Pera Padala (PPS-PEPP) Escudero Cup National Tennis Open Championships in San Pablo City Sunday.