Rafael Nadal has withdrawn from his Indian Wells semi-final against Roger Federer with a right knee injury. The world number two received treatment to the knee during his gruelling quarter-final win over Russia's Karen Khachanov on Friday. The Spaniard looked in discomfort during the match and only had a brief practice session on Saturday. 'It's The post Nadal withdraws from Federer semi-final with knee injury appeared first on Daily Trust. Click here to read full news..