Ace Indian shuttler Lakshya Sen progressed to the semi-finals to be the lone Indian survivor at the Japan Open Super 750 badminton tournament following the ouster of compatriots HS Prannoy and doubles pair of Satwiksairaj Rankireddy here on Friday.

World No. 13 Sen registered a 21-15, 21-19 victory over local player Koki Watanabe, ranked 33rd, to make his third successive semifinals, following his exploits in Canada and the United States.