Human competition is eternal. No matter what the future brings, sports will be a part of it. But what forms will these games take? Who will be the spectator, who will play? Will aliens be our opponents or machines? What rules will we play by? What will be at stake? What rewards will be reaped by the victors? What fates await the defeated? Will the entire universe be our arena or will our world be smaller than today? Visionary authors speculate on what swifter, higher, stronger will mean in the near and distant future.