By Tony Owusu A new agreement gives the company the right to use MLB players in its promotional activities in the U.S., China, and Japan. The dog days of summer are usually pretty quiet for sports books. Football is by far the biggest sport to bet on in the U.S. (globally that title goes to soccer). Last year, The American Gaming Association estimated that 45.2 million Americans, about one-in-seven, would wager on the 2021 NFL season. Basketball is the next most popular sport to bet on in the U.S., and the third most popular sport to bet on in the world (behind tennis and soccer). The AGA esti…