Alexander Zverev struggled with an injury in the spring of the previous season. The German failed to deliver his best tennis in Miami, Monte Carlo and Munich, experiencing early losses and seeking a better run in Madrid. Last year, the 2018 champion competed at a high level in Caja Magica, beating three top-10 rivals since the quarters and lifting the fourth Masters 1000 crown at 24.At the winning ceremony, the German joked with the tournament director Feliciano Lopez, saying that Lopez did not want to talk with him anymore once he defeated Rafael Nadal in the quarters. Zverev earned his third stra …