The high performance niche U.K. brand will outfit the former world top player as his four-year $25 million contract with Under Armour expires. Murray, who hopes to play at Wimbledon and retire this year, will wear Castore for the Australian Open. While Under Dog made some really good athlete bets around the time it signed Murray, including Steph Curry and Jordan Spieth, the Andy Murray ... Log in to view full article.