Marion Bartoli has been working with Jelena Ostapenko for more than two years and she has admitted that she expects the Latvian to win more Grand Slams. Ostapenko, 24, claimed her first Grand Slam title at the French Open in 2017. Ostapenko struggled with her game and results after winning the French Open but now she is starting to play the tennis she played during her run to the French Open title. Ostapenko beat four Grand Slam champions – Sofia Kenin, Iga Swiatek, Petra Kvitova and Simona Halep — en route to winning Dubai. A proud coach Bartoli was asked if she now expects Ostapenko to win more Grand Slams in the near future. “Absolutely. When I started to work with her, she was ranked 90th in the world. She rea …