LONDON: Ryan Hall came of age at last year's London Marathon, and he's back to prove he has what it takes to break up the race's African domination. Hall ran the fastest time for an American making his first appearance in a 26.2-mile race last year when he finished seventh in 2 hours, 8 minutes, 24 seconds, dropping back only in a sprint finish. "It's one thing to believe you can run fast, but it's another thing to actually go out there and do it," the 25-year-old Hall said Wednesday. "Last year I proved I can do it through 23...