The quarter-finals of the WTA grass tournament in Germany’s Bad Homburg will take place without home participation. Jule Niemeier was the last German player to lose in the round of 16 on Tuesday, going down in three sets to Spaniard Paula Badosa. A few hours before Niemeier’s exit, 15-year-old Julia Stusek was knocked out in the first round. Stusek lost to Peyton Stearns from the US in straight sets. It was the young German’s first match in a main draw on the WTA tour. Previously, three-time Grand Slam winner Angelique Kerber, former Wimbledon semi-finalist Tatjana Maria and fellow German Tama…