David Fizdale knows exactly what's wrong with the Knicks' defense"We struggle with the concepts right now"1/13/2019, 2:23 AMFeb 8, 2017; Memphis, TN, USA; Memphis Grizzlies head coach David Fizdale during the second half against the Phoenix Suns at FedExForum. Memphis Grizzlies defeated the Phoenix Suns 110-91. Mandatory Credit: Justin Ford-USA TODAY Sports / Justin Ford