The Brief Mariners fans can register for a chance to buy ALCS and World Series tickets at T-Mobile Park. The registration deadline is Thursday, Oct. 2 at 12 p.m., and ALCS ticket drawing winners will be notified by Friday. The Mariners must win their upcoming ALDS series to advance to the ALCS and World Series. Seattle Mariners fans have a limited time to register for a chance to buy tickets for the American League Championship Series (ALCS) and World Series games at T-Mobile Park. Season ticket members will also have priority presale access to ALCS and World Series tickets.