At the Denmark Open, it was a mixed week for India. Saina Nehwal defeated Carolina Marin in straight sets. Saina defeated two-time World champion Marin 22-20, 21-18 in a hard-fought battle to avenge her Japan Open second round loss to the Spaniard.Late in the day, Sindhu, however, failed to break the rhythm of World No.10 Chen to go down fighting 17-21, 21-23 in a 43-minute match. This is her second successive early loss. Earlier, Indian top shuttlers Kidambi Srikanth and HS Prannoy made positive starts but B Sai Praneeth bowed out in the opening round of men's singles competition.Srikanth overcame a spirited effort from compatriot qualifier Subhankar Dey 21-17, 21-15 to set up a clash with Korean Jeon Hyeok Jin, the 2016 Australian Open runner-up. On the adjacent court, Praneeth failed to erase 11-7 and 11-8 deficits to go down 10-21, 15-21 to local hope Hans-Kristian Solberg Vittinghus in a lop-sided contest. World No.15 Prannoy, meanwhile, recovered from a 6-11 deficit in the second game to oust Denmark's Emil Holst 21-18, 21-19 in a hard-fought match. It was his third win over the Danish shuttler. The Indian is likely to play former World No.1 Malaysian Lee Chong Wei on Thursday.Among other Indians in fray, young doubles specialist Satwiksairaj Rankireddy suffered twin defeats in mixed and men's doubles competition to end his campaign here. Satwik and his mixed doubles partner Ashwini Ponnappa, who had reached the semifinals last week at Dutch Open, lost 19-21,17-21 to local combo of Niclas Nohr and Sara Thygesen.Here is how Twitter reacted to Sindhu's loss.2nd seed PV Sindhu goes down to the Chinese shuttler Chen Yufei 17-21 21-23 in her opening match at the #DenmarkSSP.— Sameer Shirodkar (@SameerSh29) October 18, 2017Hard luck for P V SINDHU who lost fighting to Chen Ufei 21-17,23-21. https://t.co/bK95fVo2yD— BIJOY AGRAWAL (@bk_agrawal) October 19, 2017Very sorry for our #Sindhu loses to Chen Yufei 17-21 21-23 #DenmarkSSP #indianbadminton— anjali banerjee (@anjali_banerjee) October 19, 2017WOW what a couple of hours. First Chen Long falls to Lee Hyun II then Chen Yufei takes out PV Sindhu. Old and young taking seeds.— Yonex All England (@YonexAllEngland) October 18, 2017Sindhu looks nervous and chen is making sindhu do all the hardwork— india_badminton (@india_badminton) October 18, 2017Chen is using half the energy of sindhu & playing so effortlessly, sindhu losses the 1st game 17-21, sindhu has to change the strategy— india_badminton (@india_badminton) October 18, 2017Tough opening round against Carolina Marin of Spain ... quite happy with my performance today .. 22-20 ..21-18 ??.. pic.twitter.com/Yz0KSKbkup— Saina Nehwal (@NSaina) October 18, 2017