Top Indian shuttler Lakshya Sen registered an upset straight-game win over former world champion Loh Kean Yew of Singapore to storm into the semifinals of the USD 475,000 Kumamoto Masters Japan here on Friday.

Commonwealth Games champion Sen, seeded seventh, produced a superlative performance to outclass world No. 9 Loh 21-13 21-17 in 40 minutes, extending his dominance over the Singaporean with a seventh win in 10 career meetings.