Adam Peaty fired out a major warning to his Olympic rivals in Rio by breaking his own 100m breaststroke world record in the heats on Saturday.

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The 21-year-old, hotly fancied to become Britain’s first male Olympic champion in swimming since Adrian Moorhouse in 1988, came home in 57.55 seconds.

The time was 0.37secs faster than the record he set last year.

Peaty will race again in the semi-finals later this evening and said: “Hopefully tonight we are going to move it on a little bit more and see what we’ve got.

“Hopefully I’m going to feel a lot better and swim a bit faster.
“We are not going to get too complacent now, we are going to keep striving, keep pushing the boundaries and see what we get.”

Ross Murdoch qualified alongside Peaty for the 100m breaststroke semis in joint ninth (59.47secs), but Ireland’s Nicholas Quinn went out.

James Guy, who is sharing an apartment with Peaty in the Olympic Village, qualified for the final of the 400m freestyle in sixth place, coming home fifth in the final heat in 3:45.31.