The 21-year-old Indian woman's gallant attempt to emulate the feat of shooter Abhinav Bindra in the Beijing Games eight years ago and join him in the list of individual Olympic champions was foiled by two-time world champion Marin as Sindhu was confined to the silver standard.
The World No. 10, who has been simply unstoppable in the tournament so far, crumbled under the tremendous pressure created by the two-time World Champion from Spain to lose 21-19 12-21 15-21 in a high-intensity final that lasted for an hour and 23 minutes at the Riocentre here.
The two-time World championship bronze medallist also became the fifth woman player from India to win a medal in Olympics history and the first to clinch a silver. She is also the youngest Indian to win a medal at the Olympics.
Weightlifter Karnam Malleshwari (2000, Sydney), boxer MC Mary Kom (2012, London), shuttler Saina Nehwal (2012, London) and wrestler Sakshi Malik (Rio, 2016) are the other women players from India to clinch a medal in the quadrennial sports spectacle.
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Had Lebedev progressed to the final, Tomar would have been given a fresh lease of life to fight for the bronze through repechage, but it was not to be and he got eliminated.
The entire focus on day 14 of competition was on Sindhu, the lone shuttler left in the fray after the exit of Saina in the group stage, K Srikanth in the quarter finals and the men's and women's doubles teams at the group stage.
She was then outclassed in the second to lose it tamely.
In their last five meetings in the last two years, Marin
has beaten Sindhu four times with the Indian gaining an upper hand during the Denmark Super Series last year, but today she could not repeat the feat.
The hyper-aggressive Marin mixed power with precision to dominate the rallies with her acute-angled smashes interspersed with clever drops to catch the Indian often on the wrong-foot.
Sindhu struggled with the length of her strokes as she gave away many points by hitting long and wide but she fought tooth and nail till the end only to come second best.
The first three-minute period saw the Russian leading 3-0. Tomar was more purposeful in the second period as he pushed Lebedev out to get a point and then finally got a single ankle hold righ and moved behind his rival to reduce the margin to 3-5.
However, with time running out, Tomar had to go for the jugular but in the process had opened his defence which enabled the Russian to clinch the bout with a two-point manoeuvre to take an unassailable 7-3 lead.
(REOPENS FGN 36)
Meanwhile, Sandeep Kumar finished a lowly 34th in the men's 50km Race Walk event.
At the half-way mark, Sandeep was 48th with a time of 1:59:13, which was 9:42 behind the leader.
World champion Toth managed to beat 2012 London Olympics gold medallist Jared Tallent of Australia into second place with a time of 3:40:58.
Toth, 33, moved past the Australian in the latter stages of a race. The Australian racer clocked 3:41:16. Canada's Evan Dunfee (3:41:38) settled for a bronze.