Ronaldo's direct Instagram comment on Messi's October 7 retirement announcement from the Argentina national team—following the forward's farewell match against Benin—has driven the market's 100% implied probability for a "Yes" outcome. The Portuguese captain publicly acknowledged his longtime rival's 21-year international career with a respectful message highlighting Messi's achievements with the Albiceleste, marking a notable public interaction between the two soccer legends amid their storied rivalry. Trader consensus reflects this verifiable social media activity occurring within the timeframe. Even at near-certainty, edge cases like post deletion, platform glitches, or disputes over whether the comment qualifies as "posting about" Messi could theoretically shift resolution, though official reports confirm the tribute.