Mohammad Amin DOHA: Japan won mixed doubles gold at the Second Edition of WTT Star Contender Doha at the Lusail Multipurpose Hall on Friday. Shunsuke Togami and Hina Hayata defeated South Koreans Jang Woo-jin and Jeon Ji-hee 11-6, 3-11, 11-2, 11-8 in…