This paper offers an overview of trademark dilution law in the USA and then presents two recent sport-related decisions that illuminate the application of the doctrine to sport-related trademarks through interpretation of the 2006 amendments to the Federal Trademark Dilution Act of 1995 ("FTDA"). The first case involves Adidas and dilution involving a national brand while the second involves University of Texas and dilution involving a college team mark. Both decisions provide guidance to sport-related brands and sport teams, and particularly colleges and universities, that seek to bring dilution claims (typically brought in conjunction with trademark infringement and unfair competition claims).