Visa to Mastercard Change - Any Disadvantges
Discussion
Yeah, you won't be able to use the Mastercard to buy your Olympics games tickets, or to conduct any transactions whilst at the games. 
Du to Visa being one of the headline sponsors.
But more seriously, it shouldn't make too much of a difference, as every other place I know of will take both Visa and Mastercard.

Du to Visa being one of the headline sponsors.
But more seriously, it shouldn't make too much of a difference, as every other place I know of will take both Visa and Mastercard.
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