What happened: Seattle Sounders FC midfielder Paul Arriola will throw out the ceremonial first pitch at the Seattle Mariners' home game tonight, the Mariners announced. The appearance pairs the city's MLS and MLB clubs in a pregame ceremony.

Why it matters: The crossover links Seattle's two pro franchises in a community moment, the kind of cross-sport tie-in the Sounders have leaned into recently. Shared appearances like this help both clubs reach each other's fan bases during a crowded summer sports calendar.

What to watch: Watch for whether the first-pitch appearance signals further joint promotions between the Mariners and Sounders as both seasons run in parallel.