Bershawn Jackson has hit back at Great Britain’s star hurdler Dai Greene after the reigning world champion took a swipe at the American 400m hurdlers for failing to medal last summer in Daegu, Korea. American 400m hurdler Bershawn Jackson in action at Pre-Classic PHOTOS/ Randy Miyazaki “Greene said ‘he knew we weren’t going to medal; we were too overrated,” Jackson was quoted...