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The London Olympics bronze medallist was trailing 4-10 in the opening game when Marin decided to withdraw from the contest.
“It is important year for all of us. This was not good at all. She is a tough competitor, she started off well and it is unfortunate what happened today,” said Saina, who last won a BWF title in 2017 in Malaysia.
It is a creditable performance for the Indian, who had suffered a shin injury late last year.
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“I have been getting injured in the last few years. I always try to come back stronger, there is no secret. I want to thank physios and coaches who are supporting me a lot.”
Saina had won a gold medal at the 2018 Commonwealth Games, a bronze at the Asian Games, besides reaching finals at the Denmark, Indonesia Masters and Syed Modi International.