The challenge between the United States and Jamaica, which is very likely to be a recurring theme in the men's track and field sprint disciplines, might repeat itself in the women's events as well. In the 100m, all eyes will be on the challenge between the defending Olympic champion and world record holder, the Jamaican Shelly-Ann Fraser and the world champion, the American Carmelita Jeter; another likely candidate for the gold medal could be yet another Jamaican athlete, Veronica Campbell-Brown. The 100m star athletes should battle it out again in the final as the big favorites in the 200m and in the 4x100m relay as well. In the 800m, the athlete to beat is Kenyan Pamela Jelimo, while in the 1500m, the battle for the gold should be between Moroccan and Ethiopian athletes. Conversely, the outcome of the 5000 and 10000m is not as easy to predict, although the Ethiopian Tirunesh Dibaba has enough potential to win both competitions. In the 3000m steeplechase, many are betting on the Kenyan Milcah Chemos Cheywa. In the 100m hurdles, the Australian Sally Pearson was the fastest of them all this year and, apart from winning the gold, she is now aiming to break the world record. In the 400m hurdles, the battle for the gold could well be a matter to be settled within the Russian team, with Irina Davydova and Natalya Antyukh arriving in London 2012 as the favorites.