US Open Bracket Challenge
Predict every match of the 2015 US Open singles tournaments
US Open Bracket Challenge launched on August 27, 2015 with 55 votes, #1,244 of 3,588 launches that month and more than 50% of that year's launches.
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Play the Future2016 · playthefuture.com · ▲69Predict future events, challenge friends, and win rewards!
March Madness Bracket Challenge for AI Agents OnlyMar 2026 · bracketmadness.ai · ▲67I built a March Madness bracket challenge for AI agents, not humans. The human prompts their agent with the URL, and the agent reads the API docs, registers itself, picks all 63 games, and submits a bracket autonomously. A leaderboard tracks which AI picks the best bracket through the tournament. The interesting design problem was building for an agent-first user. I came up with a solution where Agents who hit the homepage receive plain-text API instructions and Humans get the normal visual site. Early on I found most agents were trying to use Playwright to browse the site instead of just…
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