Sindhu, ranked 10th in the world, went one better than her senior Saina Nehwal, bronze medal winner in London four years ago, by becoming the first ever Indian to enter the summit clash in the shuttle game in the quadrennial sports spectacle.
Sindhu defeated her short-statured, third-seeded Japanese rival, the current All England champion and world no. Six, 21-19 21-10 in 49 minutes with superb, attacking play to enter tomorrow's gold medal clash.
Sindhu's heart-warming feat came a day after woman grappler Sakshi Malik had won a bronze in the 58 kg class to end the medal drought for India in the Games on the 12th day of competition.
However, another wrestler made a tame exit from the competition today to end the women's campaign here.
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Babita Kumari lost her opening women's 53 kg category wrestling bout 1-5 against Maria Prevolaraki of Greece and got eliminated from the Games.
But the 26-year-old grappler could not succeed against the tight defense put up by her Greek rival and lost points in both the periods of their pre-quarter final bout.
And when Maria too lost her quarter-final bout against Venezuela's Betzabeth Angelica Arguello Villegas 3-6, it spelt curtains for the Indian's slim hopes of replicating Sakshi and win a bronze through the repechage process.
In the semifinal clash, Sindhu had a 1-3 head-to-head
record against Okuhara but all that went for a toss as the Indian came out with a well-thought strategy, engaging the Japanese in long-rallies with her angled returns and deft drops.
In the opening game which lasted 29 minutes, Sindhu opened up a 4-1 lead early on and rode on Okuhara's unforced errors to extend the advantage to 8-4. The Indian engaged her rival in long rallies and tried to vary the pace and finish them with well-executed drops.
The Hyderabadi pushed the Japanese to the corners by playing half smashes and drops, while Okuhara continued to find the net while trying to play the cross court drops from the baseline.
Leading 14-10, Sindhu hit wide and long before coming up with a superb drop even as Okuhara forehand returns.
At 16-18, Sindhu failed to negotiate a body return but she again caught hold of the shuttle early using her height and sent it sailing out of the Japanese reach. A missed net shot by Okuhara saw Sindhu reach the game point.
Sindhu once again opened up a 3-0 lead but the Japanese soon clawed back and grabbed a slender 5-3 lead with the Indian finding it difficult to keep the shuttle inside the court.
The duo moved neck-and-neck from 5-5 to 8-8. A forecourt deception gave a point to Sindhu but she hit wide again.
Sindhu retrieved everything that was thrown at her but she rushed on to a stroke to hit the net. At the interval, Sindhu managed a slender 11-10 lead after her return landed at the corner of the court.
It was a deceptive return which helped Sindhu reach a massive 10-point match point and then eked her name into the history books with a smash that caught Okuhara at the forecourt.
For the record, Marin also entered her maiden Olympic final beating London Olympic champion Li Xuerui 21-14 21-16.