The world number four Indian squandered a one-game lead and committed too many unforced errors to go down 21-13 18-21 19-21 to sixth seed Sung in a match that lasted an hour and six minutes.
Saina, who has a 4-0 record against Sung Ji Hyun before today's match, had beaten the Korean in last year's Indonesia Open but the past results did not count much as Sung matched the Indian with her strokes and stamina at the Odense Sports Park here.
Saina hit long and then committed a judgement of error to help Sung narrow it to 13-15 but the Indian did not give Sung anymore leeway as she took 20-13 lead. Sung then faltered with a flick at the net to help the Indian pocket the opening game.
Sung levelled the score at 6-6 with Saina making a few error in judging the shuttle. The Korean led 8-7 after the Indian hit long and then made it 10-8 with Saina's hits going to the net and wide.
Saina, however, kept the pressure on the Korean and picked up three quick points with the help of better court coverage to lead 11-10 at the interval.
