Japanese swimmer Kosuke Hagino, winner of the men's 400-meter individual medley at the Rio Olympics as well as a holder of multiple national records, has withdrawn from next month's national championships, his management agency said Friday.The 24-year-old has put in a string of poor performances recently, including at the Konami Open in February where he pulled out of the 400 IM final after finishing seventh overall in the qualifiers, more than 17 seconds off his personal best time.He also canceled a training camp at altitude that was scheduled to start on Feb. 19 in Spain."I have accepted …READ FULL ARTICLE