Rotterdam ATP quarter-finals on Thursday while ninth-ranked Holger Rune was knocked out by world number 160 Gijs Brouwer.Italian 21-year-old Sinner, ranked 14 in the world and fresh from his Montpellier title last weekend, came through 6-4, 6-3.It was only his second win over world number three Tsitsipas in seven meetings and avenged a five-set loss to the Greek player in the last-16 at the Australian Open last month.Sinner will face Swiss veteran and three-time major winner Stan Wawrinka for a place in the semi-finals.