What went down on day four in Rio

STAR OF THE DAY: Kyle Chalmers.

The 18-year-old upstaged world No.1 Cameron McEvoy to qualify second fastest for the 100m freestyle behind American great Nathan Adrian. McEvoy was third fastest.

QUOTE OF THE DAY: "It's a sport that changes on its head." Equestrian rider Shane Rose when Australia finished with one bronze after starting the day in gold medal position in the teams and individual competitions.

TALKING POINT: The Kookaburras are looking dangerously like failing to live up to their world No.1 ranking. Their second successive group loss to Belgium has left them fourth in Pool A with two pool matches remaining.

WHAT'S UP NEXT: Chalmers and McEvoy are strong medal chances in swimming's blue ribbon event on Wednesday, while Australia's basketballers take on the US Dream Team in a group match.