It's Showtime - Top 5 rivalries of 2012 London Olympics

4. Allyson Felix vs Veronica Campbell Brown

Despite running neck to neck for the past 8 years, they haven’t got enough media attention as those received by their male counterparts like Gay and Bolt. Felix, an American and Brown, a Jamaican, have been dueling each other in the 200m since 2004 and have been exchanging their top spots as the world’s best and second best. Felix is a three time world champion but has been quoted as saying that she would trade those in for the two Olympic Golds held by her Jamaican counterpart – Brown has tasted success in both Athens and Beijing by notching the top spot. Carmelita Jeter and Murielle Ahoure are the others who will test Felix’s and Brown’s nerves at London.