22 Jan 2019
Tennis: Serena Williams into quarter-finals
Serena Williams has knocked out the world number one, Simona Halep of Romania, to reach the quarter-finals of the Australian Open. And Novac Djokovic, the top men's seed, has also secured his place in the quarter-finals by ousting young Russian Daniil Medvedev. Our correspondent in Melbourne is David Luddy.