Fifth-seeded Juan Martin del Potro beat Yuichi Sugita of Japan 6-1, 6-3 in the first round of the Estoril Open Tuesday. The former US Open champion hit eight aces and broke Sugita four times to ease to the win in his clay-court debut for the season. Del Potro, who won the Portuguese tournament in 2011 and 2012, will face American Ryan Harrison next after he beat Guillermo Garcia-Lopez 6-3, 2-6, 6-2. American qualifier Bjorn Fratangelo upset sixth-seeded Joao Sousa 6-3, 6-4, and will face Taro Daniel of Japan after he beat Renzo Olivo 7-6 (2), 4-6, 7-5 in nearly three hours. Nicolas Almagro also advanced after beating the eighth-seeded Benoit Paire 6-3, 6-2, while qualifier Joao Domingues outlasted Kyle Edmund 6-4, 3-6, 7-6 (2) and Carlos Berlocq beat Elias Ymer 7-5, 6-4. On Wednesday, top-seeded Pablo Carreno Busta plays fellow Spaniard Tommy Robredo. Kohlschreiber wins Defending champion Philipp Kohlschreiber began his bid for a fourth BMW Open title with a 6-4, 6-3 defeat of Norwegian wild card Casper Ruud Tuesday. Kohlschreiber saved two of the three break points he faced from the 18-year-old Ruud to set up a second-round meeting with Horacio Zeballos of Argentina. Zeballos beat Andreas Seppi of Italy 5-7, 6-2, 7-5. Zeballos had previously reached the semifinals in Barcelona, where his tournament run was brought to a halt by Rafael Nadal. The 33-year-old Kohlschreiber, who won the Munich clay-court tournament in 2007, 2012 and 2016, leads a German sextet in the second round, including Mischa Zverev, his younger brother Alexander Zverev, veteran Tommy Haas, qualifier Yannick Hanfmann and Jan-Lennard Struff. The older Zverev defeated Dustin Brown 6-4, 6-7 (4), 6-3, while Struff also prevailed over a compatriot, Daniel Masur, 6-3, 6-4. Chung Hyeon of South Korea and Argentine qualifier Guido Pella both defeated German opponents to progress. Chung prevailed 7-6 (10), 4-6, 6-3 over Maximilian Marterer, while Pella saw off Cedrik-Marcel Stebe 6-0, 6-2. Also, Jeremy Chardy of France beat Slovakia's Jozef Kovalik 6-2, 6-4, Romanian Marius Copil defeated Thiago Monteiro of Brazil, 4-6, 7-5, 6-4, and Slovakia's Martin Klizan rallied to beat Argentina's Nicolas Kicker 4-6, 6-4, 6-3. Wozniacki advances Second-seeded Caroline Wozniacki advanced to the second round of the Prague Open by beating Misaki Doi of Japan 6-0, 7-5 Tuesday. The former No. 1 from Denmark will next face Jelena Ostapenko. Also, third-seeded Barbora Strycova dispatched Julia Goerges of Germany 6-4, 6-0 to play another Czech, qualifier Lucie Hradecka. Fourth-seeded Sam Stosur beat Evgeniya Rodina 6-2, 6-3. The Australian will play next face Brazilian qualifier Beatriz Haddad Maia, who defeated Christina McHale 6-3, 6-4. Fifth-seeded Lucie Safarova, the defending champion, came from one set down to beat Kristina Kucova 3-6, 7-5, 6-3 while unseeded Mona Barthel upset sixth-seeded Shuai Zhang 6-0, 6-3. Ana Konjuh, Katerina Siniakova, Kristyna Pliskova and Natalia Vikhlyantseva also advanced on Tuesday. Kvitova back at practice Two-time Wimbledon champion Petra Kvitova is back at practice, less than six months after being attacked by a knife-wielding intruder. Kvitova posted a photo on Instagram Tuesday showing herself swinging a tennis racket . She included the message: "I hope this picture makes you as happy as it makes me! I am in Monaco and guess what? I'm back on the tennis court, hitting with some proper balls. ..." Kvitova has missed all season so far while recovering from surgery on her left, racket-holding hand in December. She was injured during an attack at her home in the Czech Republic. She said last month that she was signing up for the French Open, which begins May 28, in hopes of being able to compete but she wasn't sure whether she would be ready. Kvitova was the Wimbledon champion in 2011 and 2014. She climbed as high as No. 2 in the WTA rankings. — Agencies
