Ace Indian shuttler PV Sindhu will lock horns with higher seed Carolina Marin of Spain in the semi-finals of the BWF World Badminton Championships in Copenhagen, Denmark today. Eleventh placed Sindhu had showcased a brilliant performance yesterday and defeated world number two Shixian Wang of China 19-21, 21-19, 21-15 in the quarterfinals, assuring herself a second consecutive bronze medal in the Championships.Saina Nehwal, however, could not beat world number one Xuerui Li in the other quarterfinal. She lost the match, 15-21, 15-21.