Player joins Twitter after reaching his 1st Grand Slam semis
World number 58 Hyeon Chung joined microblogging site Twitter after reaching the Australian Open semi-finals on Wednesday. The 21-year-old defeated US' Tennys Sandgren in straight sets to enter Grand Slam semi-finals for the first time in his career. "First Grand Slam semifinal, first tweet. Hello and thank you all for your support," Chung's first tweet read.