What happened: The Seattle Mariners threw their support behind Cristian Roldan, amplifying his "Let's go win a World Cup!" rally cry on Friday. The message put one of baseball's clubs squarely behind the American push at the tournament being staged on home soil this summer.

Why it matters: Crossover moments like this show how deeply the 2026 World Cup has soaked into the wider American sports landscape, with franchises from other leagues publicly rallying behind the national team's run. For Seattle, embracing Roldan ties the city's baseball fan base to the tournament's knockout-stage stakes.

What to watch: Watch for the United States' next knockout-round match as the tournament advances, and whether more crossover support follows from clubs in other sports.