Daniel Caligiuri of FC Schalke 04, Mahmoud Dahoud of Borussia Dortmund, Maximilian Philipp of Borussia Dortmund and Benjamin Stambouli of FC Schalke 04 vie for the ball during the Bundesliga match between FC Schalke 04 and Borussia Dortmund in Gelsenkirchen, Germany, on April 15, 2018.(Xinhua/Joachim Bywaletz)