Karlovic topples Lopez, Hewitt advances

Croatian Ivo Karlovic pounded 19 aces past second-seeded Feliciano Lopez in beating the Spaniard in straight sets to reach the quarter-finals of the US National Indoor Tennis Championships on Thursday.

Lu books Memphis quarter-final

Fourth-seeded Lu Yen-Hsun of Taiwan rallied for a three-set victory over US qualifier Denis Kudla on Thursday to reach the quarter-finals of the US National Indoor Tennis Championships.