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Hourly Briefing ·

Infiniti Intelligence Hourly Briefing — Oct 28, 2026 · 1:24 PM ET

2 stories in this edition: Frances Tiafoe wins priced at 1.0% on Kalshi, down 52.0 points, on $3.7M traded · Polymarket US agrees to stop offering new sports-related event contracts in Michigan and close out remaining Michigan positions by Nov. 25, 2026

Frances Tiafoe wins priced at 1.0% on Kalshi, down 52.0 points, on $3.7M traded

PredictionBubbles' sports board, fresh on its Oct. 28, 17:11 UTC read, lists the Tiafoe contract as its biggest downward sports move, in a sports markets category…

Tiafoe contract leads the declines

A Kalshi contract on Frances Tiafoe winning stood at a market-implied probability of 1.0%, down 52.0 percentage points over 24 hours, with $3.7M in total traded volume, according to PredictionBubbles. The sports board’s Oct. 28, 17:11 UTC reading placed it at the top of the category’s downward moves.

The supplied material does not identify the match or tournament covered by the contract, or explain what drove the decline. The price therefore documents a sharp repricing, but does not establish a sporting result or the contract’s settlement status.

Movement and volume measure different things

PredictionBubbles ranks movers by the absolute change in probability over the preceding 24 hours, while its volume rankings use total traded volume. The $3.7M figure should not be read as the amount traded during Tiafoe’s decline. According to the site, the highest-volume open sports market at its latest refresh was the Polymarket contract on Shakhtar Donetsk winning the 2026-27 UEFA Champions League Championship, with $36.7M traded.

The board covers 552 open sports markets: 203 on Kalshi and 349 on Polymarket. Its embedded display contains the 300 largest by volume, and its data refreshes every 15 minutes even though trading on the venues is continuous. PredictionBubbles displays exchange prices rather than accepting wagers or holding customer funds.

What it means for prediction markets

  • A low price is not a settled outcome. The 1.0% reading reflects traders’ pricing at the reported snapshot, not confirmation that the contract has resolved.
  • Volume does not explain the move. The $3.7M total provides context for trading activity, but the supplied data does not isolate transactions behind the 52.0-point decline.
  • Contract details matter. Without the underlying event and resolution terms, the Tiafoe price cannot be fully interpreted. PredictionBubbles also cautions that related questions across Kalshi and Polymarket can have different wording and settlement rules.
  • Timing matters. A board refreshed every 15 minutes can differ from current exchange prices, particularly as sporting events unfold.
  1. Predictionbubbles (predictionbubbles.net)https://predictionbubbles.net/markets/sports/

Polymarket US agrees to stop offering new sports-related event contracts in Michigan and close out remaining Michigan positions by Nov. 25, 2026

The Michigan Gaming Control Board announced Oct. 28 that QCX LLC, doing business as Polymarket US, agreed to cease new sports-related event contracts for Michigan…

Michigan agreement limits sports contracts

QCX LLC, doing business as Polymarket US, has agreed to stop offering new sports-related event contracts in Michigan, according to an Oct. 28 announcement by the Michigan Gaming Control Board on michigan.gov.

The agreement also calls for remaining Michigan positions to be closed out by Nov. 25, 2026. That creates two distinct steps: ending new sports-related contracts and winding down outstanding positions.

Scope and timing

The announcement concerns Polymarket US and its activity in Michigan. The supplied material does not establish any change to the platform’s offerings elsewhere or to other categories of event contracts.

The source page’s full text was unavailable. Beyond the agreement and closeout deadline, the provided headline and summary do not specify how remaining positions will be handled or detail the legal basis for the arrangement.

What it means for prediction markets

  • New contracts: The agreement ends new sports-related event contracts for Michigan, according to the Michigan Gaming Control Board.
  • Outstanding positions: Nov. 25, 2026 is the stated deadline for closing out remaining Michigan positions; the supplied material does not explain the mechanics.
  • Limited scope: The announcement alone does not establish a broader withdrawal by Polymarket US from other states or contract categories.
  1. Michigan (michigan.gov)https://www.michigan.gov/mgcb/news/2026/10/28/polymarket-backs-down-in-michigan

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