Who will be the #1 ranked ATP men's singles player on Dec 31, 2026?

If Lorenzo Musetti is the #1 ranked on the PIF ATP singles rankings on Dec 31, 2026 at 12:00 PM ET, then the market resolves to Yes. For the purposes of this market, resolution will be based on the most recently published PIF ATP Rankings available at the time of resolution. Kalshi is not affiliated, associated, authorized, endorsed by, or in any way officially connected with the Governing League. All trademarks, logos, and brand names are the property of their respective owners.