Four reasons Andy Murray isn't a member of the Big Four – The Brit suffered an …

Britain's Andy Murray made swift progress into the US Open fourth round as he swept past Brazilian Thomaz Bellucci in straight sets. Murray had needed five sets to win his previous round but saw off 30th seed Bellucci 6-3 6-2 7-5 in the New York night 

It's been a frustrating 4th Round for Andy Murray at the U.S. Open, as the Scot made his racquet into a broken souvenir for one (un)lucky fan after letting South African Kevin Anderson back into a must win third set.

Kevin Anderson, of South Africa, serves to Andy Murray, of the United Kingdom, during the fourth round of the U.S. Open tennis tournament, Monday, Sept. 7, 2015, in New York. (AP Photo/Jason DeCrow) 

Tennis star Andy Murray has dealt a major blow to Under Armour's fledgling tennis business. Murray is under a four-year sponsorship deal with the Baltimore-based retailer. Under the contract, he's supposed to wear UnderÂ