The probability for the "Jaume Munar" option in Polymarket's "US Open ATP: Jaume Munar vs Terence Atmane" submarket fell sharply from 84.35% one hour ago to 67.2%, a drop of 17.15%. According to ChainCatcher, the move was tracked in the prediction market event for the U.S. Open match between Jaume Munar and Terence Atmane. The article did not provide a reason for the sudden fluctuation.