Former US Open champion Marin Cilic will return for the Bank of China Hong Kong Tennis Open next month, joining nine players ranked in the world’s top 50 who have signed up to take part. Cilic, 37, who won the US Open in 2014, last played at the Hong Kong Open in January last year – when it returned for the first time in almost 20 years – but lost in the first round to Germany’s Jan-Lennard Struff. That loss came during an injury-blighted period for the Croatian, when the former world No 3 fell...