Former World No. 3, Srikanth defeated Sweden's Henri Hurskainen 21-6 21-18 in the second match of group H that lasted 34 minutes here.
Srikanth thus avenged his loss to Henri in 2014 Swiss Open. The World No. 11 Indian, who had won the 2014 China Open and 2015 India Open, stamped his authority with his strokes and also pushed his rival to make mistakes.
Stung by the first game reversal, Henri raised his game and fought hard to move neck-and-neck from 8-8 to 11-11. Srikanth opened up a 15-12 lead but the left-handed shuttler kept breathing down the neck of the Indian.
In the end, it was two long shots from Henri which helped Srikanth to seal the issue in his favour and reach the pre-quarterfinals.
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Earlier, in one of the biggest upsets for the Indian Olympic contingent, Saina crashed out of the Rio Games after suffering an upset straight-game loss against lower-ranked Maria Ulitina of Ukraine in her second Group G match.
The Indian star, a former world no. 1, had won the opening match against Brazil's Vicente Lohaynny on August 11.
Maria, who had beaten Vicente in the opening match, reached the knockout stage from Group G at the expense of Saina and the Brazilian girl.
Saina looked totally rusty as she squandered an initial 6-1 lead to allow Maria level the scores at 8-8 with the Indian burying the shuttle in the net.
Maria caught up again at 13-13 when Saina hit long. She infact took a slender lead at 16-15 and 17-16 as Saina struggled with her movements.
With Saina continuing to be sluggish, Maria reached 19-17 and then reached game point with a cross court round-the-head smash which caught Saina napping.
The Indian then hit wide to allow Maria earn the bragging rights after clinching the opening game.
But Maria dominated the pace of the rallies even as Saina seemed restricted in her movement as the Ukraine player led 14-13.
The script didn't change much after that as Maria managed to reach match point with a cross court smash and then entered the knock-out pre-quarter final round with a lucky net chord.
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