Laura Muir is refusing to be drawn on talk about her potential Olympic medal hopes, insisting all she is thinking about is the 1500m semi-final.

The Scot, who is ranked fourth in the world, coasted through her heat on Tuesday, finishing second in a time of three minutes 58.91 seconds.

It was an assured start for the Scot, who broke her own British record over the distance in the Diamond League meeting in Paris last month.

A 1500m silver medallist at the last Olympics, she batted aside any questions about whether she can go one step better this time round.

“It is so easy to think about the final, but I have got to think about the semi first because that is going to be pretty crazy,” Muir told BBC Sport Scotland.

“I am really, really relaxed. I have never been in this position before as a reigning Olympic medallist. I have nothing to lose so if I can just enjoy it and stay relaxed, I know I can run fast.”