By Justin Palmer
LONDON (Reuters) - Trinidad & Tobago's Keshorn Walcott completed a remarkable double by taking a surprise Olympic javelin gold on Friday, less than a month after becoming world junior champion.
The 19-year-old, crowned global junior champion in Barcelona on July 13, won gold with an 84.58 metre throw, a personal best. He was the youngest winner of an Olympic javelin title.
Ukraine's Oleksandr Pyatnytsya won silver with a 84.51 effort and Antti Ruuskanen of Finland took bronze with 84.12.
Norwegian Andreas Thorkildsen, bidding for a third successive Olympic gold, was sixth.
(Reporting by Justin Palmer, editing by Ed Osmond)