Bob Costas raps '99 Problems' during Yankees-Mariners game

Jay Z's name comes up a lot more often in baseball broadcasts thanks to Seattle Mariners second baseman Robinson Cano signing him as his representation last season.

But play-by-play announcer Bob Costas had the best reference when he spotted a sign that prompted him to rap Jay Z's "99 Problems" during Wednesday's broadcast of the Mariners' game against the New York Yankees on MLB Network.

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