Rafael Nadal and Alexander Zverev met for the eighth time in the last year’s Madrid Masters quarter-final. Nadal had the upper hand in their first five meetings, and the German changed that on an indoor court in Paris and London at the end of 2020.Zverev experienced early losses in Miami, Monte Carlo and Munich last year and raised his level in Madrid to reach the last eight. Alexander defeated Kei Nishikori and Daniel Evans in straight sets to set the quarter-final clash against a four-time Caja Magica champion Rafael Nadal.The German was aware of how tough it is t …