A 2015 finalist, Saina was blown away by world no 19 Line in the opening game but the experienced campaigner kept her cool to take the match to the decider and eventually come up trumps against her Danish rival.
World No.9 Nehwal went past the Scottish shuttler 21-17, 21-18 in the first round of women's singles.
Fifth-seeded Sindhu, who was beaten by Sung Ji twice in last three meetings, lost 16-21, 22-20, 18-21, despite saving as many as eight match points in the second and third game.
After announcing his arrival in 2016 with a junior world record, the 21-year-old had a phenomenal season last year, winning a gold each in the Commonwealth Games and Asian Games.
Roach feels India's first Olympic medallist in boxing has what it takes to be a world champion in the highly competitive US circuit.
It was Sindhu and Saina's mentor and current chief national coach P Gopichand, who was the last Indian to win the championship back in 2001.
The denial of visa to Pakistani shooters had led to the International Olympic Committee suspending discussions with India for hosting future global events.
Punia, a World Championship silver medallist, overpowered Jordan Oliver of USA 12-3 in the 65kg freestyle final to begin the season on a resounding note in the Bulgarian city.
Vismaya, who had won a team gold in 4x400m at the 2018 Asian Games, has only been competing in international tournaments since last year.
Sai Charan Koya beat Perkasa Belawa 21-11, 21-19 inside 38 minutes to move into the pre-quarters of the Dutch Junior International.
Security has been heightened in major Indian cities after the IAF bombed terrorist camps across the Line of Control (LOC) in retaliation for the Pulwama terror attack on February 14.
The application, developed by SAI as part of the Khelo India Scheme, aims to further the Prime Minister's vision to develop the sporting ecosystem in India and turn it into a global sporting superpower in the years to come.
The Indian pair shot a total of 483.5 to finish on top of the podium to finish the tournament with a flourish after a few results that did not go their way over the last three days.
The actor, who is also a professional equestrian, bagged the silver medal in the national championship.
Saurav Ghosal, seeded 11th, won 11-13, 11-7, 11-7, 13-11 against Wales player Joel Makin in the PSA World Squash Championship.
Reigns told the crowd he was terrified and scared before disclosing in October that the disease had returned.
Manu Bhaker finished 14th with 573 in the qualifications while Heena Sidhu was placed 25th with 571.
Saurabh, whose every shot were met by ecstatic cheers from the crowd, said it was special winning at home.
In the final, the shooter created a new world record with a score of 245.
Manpreet led the Indian team to an unbeaten streak at the Asian Champions Trophy in Muscat where the team was declared joint winners with Pakistan.
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