At the World Juniors in Kingston last year, USA triumphs in the Men's 4x100m in a WJR, Jamaica was not far off setting a NJR. The table was turn in the female catagory with the Jamaican team narrowly missing the WJR. The US team ran well below the 43.00secs barrier then. Interestingly, the entire Jamaican female winning team are still juniors while the Americans can field an equally impressive set of juniors. The stage is set at the Junior Pan Am for a battle royal between both nations in sprint relays. My bet is that the USA men team will run under 39.00secs to win and the Jamaicans will lower thier NJR of 39.15sec. Both USA and Jamaica can break the WJR in the female catagory . I will give the caribbean team the nod over USA.