Even if you don't have a clue about athletics, you'll probably recognise Jessica Ennis
. The heptathlete and face of Olay and BP has even had her likeness spray-painted onto a field near Heathrow
, making her the first face seen by people arriving into London!
The track and field star missed the Beijing Olympics because of a stress fracture, and this disappointment has driven her for the last four years - she won the 2009 World Championships and smashed Denise Lewis's long-standing British record along the road to London.
Medal chances: Golden
Watch: August 3 and 4, Olympic Stadium