Yokohama F Marinos on Tuesday announced the sacking of manager Harry Kewell less than seven months after his appointment at the J-League first-division club. The 45-year-old former Leeds United and Liverpool star had stepped into the role left vacant by Australian compatriot Kevin Muscat, who steered Marinos to a J1 title in 2022 and second place in 2023 before his departure for Chinese champions Shanghai Port. Marinos snapped a four-game skid Sunday with a 4-1 victory against Kashima Antlers, but they sit 12th in the J1 standings with eight wins, five draws and 10 losses — far short of the e…