After starting the final cross and shooting event first, the Lithuanian pentathlete finished with 5,312 points and triumphed over Heather Fell of Great Britain by 64 points. Asadauskaitė swapped last year's silver into gold.
Yane Marques of Brazil came in third with 5,200 points.
Another Lithuanian athlete, Gintarė Venckauskaitė, finished in the last 36th place with 4,020 points.
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