Defending champion Philipp Kohlschreiber and top-seeded Gael Monfils both lost at the BMW Open Thursday. Kohlschreiber, who had been going for an unprecedented fourth title at the clay-court tournament, failed to convert any of his three break points and lost to Horacio Zeballos 7-6 (5), 6-4 in the second round. Monfils, who had been given a first-round bye, lost to Chung Hyeon of South Korea 6-4, 6-2. The 78th-ranked Chung will next play either Martin Klizan or Mischa Zverev. Also Thursday, fourth-seeded Fabio Fognini lost to Argentine qualifier Guido Pella 6-3, 6-2. Pella will next race Zeballos in the quarterfinals. Veteran Tommy Haas' last appearance at the BMW Open ended in a 6-4, 7-5 defeat to fellow German Jan-Lennard Struff in the second round Wednesday. Struff hit seven aces and saved five of the seven break points he faced to win in just under an hour and a half against the 39-year-old Haas, who won the clay-court tournament in 2013. Struff goes on to a quarterfinal against No. 3 Alexander Zverev, last year's runner-up. The 20-year-old Zverev hit five aces to beat Jeremy Chardy of France 6-4, 6-4. Safarova withdraws Defending champion Lucie Safarova withdrew from the Prague Open on Wednesday ahead of her second-round match against Kristyna Pliskova because of illness. Organizers said she was ill before the tournament and her condition worsened after her 3-6, 7-5, 6-3 victory over Kristina Kucova on Tuesday. In the quarterfinals, Pliskova will face 144th-ranked Beatriz Haddad Maia. The Brazilian qualifier beat fourth-seeded Samantha Stosur 6-3, 6-2. Big-hitting Jelena Ostapenko rallied to eliminate second-seeded Caroline Wozniacki 5-7, 6-3, 7-6 (5). The Latvian will play Ana Konjuh next. Third-seeded Barbora Strycova defeated qualifier Lucie Hradecka 6-3, 7-5 and will meet Katerina Siniakova in the quarterfinals. Siniakova beat Natalia Vikhlyantseva 4-6, 6-4, 6-4. Camila Giorgi advanced with a 4-6, 6-3, 6-2 victory over Qiang Wang of China. She will next play qualifier Mona Barthel. Nastase slams Wimbledon over Royal Box snub Former Romanian world number one Ilie Nastase called Wimbledon organizers "small-minded" after they announced he would not be invited to the Royal Box at this year's championships. The 70-year-old was provisionally banned from all International Tennis Federation (ITF) events after verbally abusing opposing team members and the umpire when he captained Romania in a Fed Cup tie against Britain last month. The former French and US Open champion had already run into trouble after making a derogatory comment about world No. 1 Serena Williams' unborn child ahead of the World Group II playoff tie in Constanta. "What does Wimbledon have to do with what I said about Serena and at the match in Romania?" Nastase told Romanian website ProSport. "If I did something stupid at Wimbledon then I'd understand... But in this case, I don't get it. "In 1973, when everyone else refused to play at Wimbledon (because of a boycott by the Association of Tennis Professionals) but I did — does that not count for something? "If they are going to be so small-minded about it, there's nothing I can do." The ITF said last month it was launching further investigations into the incidents during the Fed Cup tie and would make no further comment until they were completed. — Agencies