Mertens' disappointing moment at BJK Cup

Belgian's retirement sees Aussies through to semi-finals (Source: Twitter)

Video transcript

- We felt he was coming, didn't we? She had the treatment in discussions with her captain and felt she wasn't able to continue. Treatment to the shoulder, treatment to the elbow. A lot of tennis that Mertens has played in the last few days, towards the end of a long season. And it's congratulations, Australia.

They are through. There's your confirmation. Australia back into the semi-finals for a third consecutive season.