Lakshya, who had reached the finals at Senior National Championship in February, defeated Michal 20-22 21-18 21-15 in a men's singles match that lasted an hour and 10 minutes.
The Uttarakhand shuttler, who turned 16 today, will next take on Sri Lanka's Dinuka Karunaratna in the semifinals tomorrow.
The World Junior No. 1 shuttler was recently sent to train under former All England champion Peter Gade, who is currently the head coach of France.
In June, Vaishnavi had won her maiden international title when she triumphed in the U-15 girls singles and U-17 girls doubles at the Pilot Pen Age Group Badminton Championship in Singapore.
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