World No.1 Carlos Alcaraz sealed Spain’s berth in the Davis Cup quarter-finals on Sunday by beating South Korea’s Kwon Soon-woo in straight sets. 

US Open champion Alcaraz won 6-4, 7-6 (7/1) against his 74th-ranked opponent at home in Valencia, after Roberto Bautista Agut had earlier beaten Hong Seong-Chan 6-1, 6-3.