MEMPHIS: Fourth-seeded Lu Yen-Hsun of Taiwan rallied for a three-set victory over US qualifier Denis Kudla on Thursday to reach the quarterfinals of the US National Indoor Tennis Championships. Lu, 30, downed Kudla 3-6, 6-3, 6-3 to set up a clash with another American qualifier, Alex Kuznetsov, in the $647,000 ATP event. Kuznetsov toppled eighth-seeded Mikhail Kukushkin of Kazakhstan 2-6, 6-3, 7-6 (7/1). Lu will be hoping to improve on his career-best season start. He is 8-2 in 2014 and reached his first ATP Tour final last month in Auckland.