Memphis, TN (SportsNetwork.com) - Second-seeded Feliciano Lopez was defeated while Lleyton Hewitt was a victor in second-round action on Thursday at the U.S. National Indoor Championships.
Croatia's Ivo Karlovic took down Lopez in the last match of the night 7-6 (7-2), 6-4 at The Racquet Club of Memphis.
Lopez was last year's Memphis runner-up to this week's top seed, Japan's Kei Nishikori.
Australia's Hewitt dropped his first set to Cypriot wild card Marcos Baghdatis, but rallied for a 6-1, 6-2, 6-0 victory.
Also on Day 4, fourth-seeded Yen-Hsun Lu of Taipei overcame American qualifier Denis Kudla 3-6, 6-3, 6-3 and 141st-ranked American qualifier Alex Kuznetsov ousted eighth-seeded Mikhail Kukushkin of Kazakhstan 2-6, 6-3, 7-6 (7-1). Lu and Kuznetsov will square off here on Friday.