Stefanos Tsitsipas and Alex de Minaur moved into the semi-finals at the Next Gen Finals in Milan after victories on Wednesday. Top seed Tsitsipas was in dominant form against Frances Tiafoe, beating the American, who had also prevailed in his opening contest, 4-3, 4-3, 4-2. "I never dropped my performance, I always stayed at 100 per cent almost, so I …