Mercy Cherono Koech is a Kenyan professional long-distance runner. She was the silver medalist in the 5000 metres at the 2013 World Championships in Athletics.

The 3000 metres or 3000-metre run is a track running event, also commonly known as the "3K" or "3K run", where 7.5 laps are run around an outdoor 400 m track, or 15 laps around a 200 m indoor track.