Former world number five Jelena Ostapenko continued to build momentum ahead of the Australian Open by reaching the Adelaide International semi-finals with a 7-5 6-3 victory over Marta Kostyuk on Thursday. The 12th-ranked Latvian made her Grand Slam breakthrough by winning the 2017 French Open title and is starting to rediscover her top form for the Jan. 14-28 Australian Open, where she will begin her campaign against local hope Kimberley Birrell.
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