This has to be the fiercest rivalry in the US distance ranks on the women's side and it continues tomorrow in the Diamond League Paris meet. (Our previews i here:
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Jenny Simpson comes in high after her bronze medal, which she got at the expense of Rowbury who finished one spot back at the Olympics.
Simpson comes in with more hardware (Olympic bronze, plus a Gold and silver at Worlds) but Rowbury has the American record (3:56.29).
Rowbury's PB is actually nearly a second better than Simpson's (3:57.22).
So how fast do they run and who comes out on top?