US sports betting handle reached roughly $166 billion in 2025 across 39 states plus D.C., with mobile platforms accounting for over 80% of wagers and New York, Illinois, and New Jersey leading individual markets. Early 2026 data shows a modest year-over-year decline through Q1, with handle at approximately $40-43 billion, marking the first quarterly dip since the pandemic amid market maturation and higher hold percentages that boosted revenue despite lower volume. Growth is now projected in the 10-15% range annually as saturation sets in mature states, though new launches and expanded online access could add incremental handle. The 2026 FIFA World Cup, hosted across North America, stands out as a major near-term catalyst, with analysts forecasting several billion dollars in additional US wagers alone from the expanded 48-team tournament. Sustained NFL, NBA, and college football engagement, alongside rising in-play and same-game parlay activity, continue to support volume even as overall expansion slows.