World number eight Tyrrell Hatton became the fourth player to withdraw from this week's Valspar Championship in Palm Harbor, Florida, after receiving a positive test for COVID-19, the PGA Tour said on Tuesday. The Englishman, who finished in a share of eighth place at last week's Zurich Classic of New Orleans team event with 2016 Masters champion Danny Willett, was among the top players in this week's field at Innisbrook Resort's Copperhead course. "Hatton will have the PGA Tour's full support throughout his