Australian Open: Naomi Osala beat Hsieh Su-Wei 6-2, 6-2 to seal a berth in the semi-finals. World number three Naomi Osaka sailed past Hsieh Su-wei in straight sets Tuesday to book an Australian Open semi-final against either Serena Williams or Simona Halep. The Japanese three-time Grand Slam champion overcame the Taiwanese world number 71's unorthodox style 6-2, 6-2 in an all-Asian quarter-final at a crowd-less Rod Laver Arena. "I was pretty calm. I'm really happy how I played today," said Osaka, who hit