Former champion P V Sindhu progressed to the women's singles second round but Lakshya Sen went down fighting to world number one Viktor Axelsen at the Singapore Open Super 750 badminton tournament on Wednesday. Sindhu had last won a BWF title at Singapore two years back and she entered the tournament after signing off with a runner-up finish at Thailand Open last week. Up against world no. 21 Line Hojmark Kjaersfeldt of Denmark, the Indian registered a 21-12 22-20 win in a 44-minute opening round to set up a mouth-watering battle against Rio Olympic champion Carolina Marin of Spain. World No. 3 Marin has an overwhelming 11-5 record against the Indian. The last time the two clashed, it turned out to be an ill-tempered match at Denmark Open which saw both players receiving yellow cards for verbal exchanges.