MEMPHIS: Defending champion Kei Nishikori rallied to reach the semifinals of the $647,000 ATP US Indoor Championships on Friday (Saturday in Manila), but Australian third seed Lleyton Hewitt was eliminated by American Michael Russell. Nishikori battled back to defeat Russian Alex Bogomolov 3-6, 6-3, 6-2 to book a last-four berth against Russell, who downed Hewitt 6-3, 7-6 (8/6). Russell earned his first victory in four career meetings with the Australian in one hour, 48 minutes. Taiwan fourth seed Lu Yen-Hsun also advanced, ousting US qualifier Alex Kuznetsov 6-1, 6-4 in 74 minutes to reach a semi-final against Croatian Ivo Karlovic, a 7-6 (7/4), 6-7 (3/7), 6-3 winner over American Jack Sock. Nishikori, an ATP top seed for the first time, saved all four break points he faced in the final set to win after two hours and 18 minutes.