Task: Question Generation
Input (English): Passage: After the Australian Open, Hewitt played as part of the Australian representative team for the Davis Cup. He lost his match against Jo-Wilfried Tsonga 3–6, 2–6, 6–7 (2–7). He then competed in the 2014 U.S. National Indoor Tennis Championships in Memphis, Tennessee in the United States of America. With a bye in the Round of 32, he went on to defeat Marcos Baghdatis in three sets 1–6, 6–2, 6–0 before losing to Michael Russell (tennis) 3–6, 6–7 (6–8). His next tournament was the Delray Beach Tournament where he beat Bradley Klahn in straight sets 6–3, 6–1. He then versed his compatriot Marinko Matosevic but was forced to retire after injuring his shoulder. The score was 6–7 (2–7).
Output (English): Who was forced to retire?