Aslan Karatsev makes history in reaching Australian Open semi-finals

Aslan Karatsev reacts after winning a point against Grigor Dimitrov (Andy Brownbill/AP)

Aslan Karatsev became the first grand slam debutant in the Open era to reach the semi-finals after beating an injured Grigor Dimitrov at the Australian Open.

Dimitrov won the first set but became increasingly hampered by a back spasm and during the third and fourth sets was struggling to serve and move around the court.