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Nigeria is going to the Olympics for the first time, and an NBA castoff led them there. Ike Diogu took over the game after it was tied with 5 1/2 minutes remaining, making four consecutive shots — two of which were 3-pointers — to lead the African nation to an 88-73 victory over the John Calipari-coached Dominican Republic. Nigeria will be grouped with Lithuania in Team USA’s bracket at the London Games, while Russia — the third team to qualify at the