Alexander Zverev’s poor season continued on Wednesday when the German number one lost to Danish teenager Holger Rune 3-6, 2-6 at the ATP tournament in Munich. He received a bye in the first round as the top seed but the world number three had no answers to the unheralded 18-year-old, who sits at 70 in the rankings. A stunned centre court could hardly believe how much he was dominated by the Dane, especially with his dropshots. Zverev also made several basic errors. Zverev, Olympic champion last year, has no titles so far this season and hit the headlines in February when he smashed his racket …