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Former world number one Naomi Osaka moved into the Miami Open semi-finals with a straight-set win over American Danielle Collins. The Japanese four-time Grand Slam champion, who has yet to drop a set in the tournament, served 13 aces in a 6-2 6-1 win that lasted exactly an hour. Australian Open finalist Collins appeared to be struggling with a neck injury throughout the match. Osaka will play Belinda Bencic of Switzerland in the semi-finals. Olympic champion Bencic beat Australia’s Daria Saville 6-1 6-2 to reach the last four.