Nadal secures semi-final spot at Australian Open

Rafael Nadal has secured a spot in the Australian Open semi-finals, with a crushing defeat over Frances Tiafoe of the United States. Nadal is yet to lose a set in the tournament and he will face 20-year-old Greek Stefanos Tsitsipas, who knocked Roger Federer out of the tournament earlier this week. For the latest on the Australian Open, our correspondent in Melbourne is David Luddy.