Britain's Lynsey Sharp recorded a personal best of one minute 57.69 seconds as she finished sixth in the women's 800m final.
Sharp had hoped to be challenging for a medal but was happy with her performances, especially after failing to make the final at the World Championships last year.
The Scot said: "It was very competitive. I ran the fastest I've ever run in an Olympic final. I know I can go faster but I'm still happy with that performance.
"The thing I'm most happy with this week is to get through the rounds clean after the disappointment last year. It's actually harder to make the final than it is to run in the final so I was very happy to make the final and to do myself justice."
Addressing the controversy over the gender row engulfing race winning South African Caster Semenya, Sharp told the BBC: "I have tried to avoid the issue all year. You can see how emotional it all was. It is out of our control. We rely on people at the top sorting it out.
"The public can see how difficult it is with the change of rule but all we can do is give it our best."