If you didn’t know the name John Korir before this year’s Boston Marathon, it might be because you weren’t paying attention when he won Chicago last year in under 2:03. But it also might be because plenty of talented runners show occasional moments of glory. It’s when a runner repeats the performance on the big stage that spectators start to wonder: are we seeing the rise of the next marathon king? Let’s take a closer look and find out.

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