Enter the Mastercard MLB Postseason 2026 Sweepstakes | Major League Baseball. Prize: each receive a pair of tickets to a World Series game (ARV $599 each) 12 First Prize winners (2 per entry period) will each receive an MLB jersey and hat of their selected team…. Entry frequency: Weekly Entry. Eligibility: Open to Mastercard cardholders whose account was opened before March 25, 2026 only. Ends September 20, 2026.