MasterCard International, which snatched a sponsorship deal with Major League Baseball last October after Visa U.S.A. was thought to have it sewn up, is preparing to make the most of its victory.

On Monday, MasterCard announced a set of baseball-related promotions to run from July through September. MasterCard called it a "triple play" because it includes consumer discounts, a sweepstakes, and charitable contributions.

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