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Spain’s world number one Carlos Alcaraz defeated American Tommy Paul in straight sets to reach the quarter-finals of the Miami Open.<\/span><\/p>\n The 19-year-old US Open champion won 6-4 6-4 to extend his winning streak to nine matches.<\/span><\/p>\n<\/div>\n Alcaraz must defend his title in Miami in order to stay atop the ATP rankings.<\/span><\/p>\n He will play another American, Taylor Fritz, in the last eight after the ninth seed beat Denmark’s Holger Rune 6-3 6-4.<\/span><\/p>\n Tournament victory would also see him achieve the rare ‘Sunshine Double’ following his title win at Indian Wells earlier in March.<\/span><\/p>\n Elsewhere, Russian Karen Khachanov recorded his first victory over second seed Stefanos Tsitsipas, beating the Greek 7-6 (7-4) 6-4.<\/span><\/p>\n Seeded 14th, Khachanov will play the winner of the fourth-round tie between Argentina’s Francisco Cerundolo and Italian Lorenzo Sonego.<\/span><\/p>\n Sonego’s compatriot 10th seed Jannik Sinner defeated Russian Andrey Rublev 6-2 6-4 and will play Finland’s Emil Ruusuvuori in the last eight.<\/span><\/p>\n In the women’s draw, Wimbledon champion Elena Rybakina progressed to the semi-finals with a 6-3 6-0 win over Italy’s Martina Trevisan.<\/span><\/p>\n The Kazakh 10th seed could also achieve the Sunshine Double if she was to win the tournament, while she is now unbeaten in 12 matches.<\/span><\/p>\n