Jenny Simpson, arguably the best female miler in U.S. history, plans to make the New York City Marathon on Sunday her last professional race. “I’m really focused on this just like any other race,” Simpson told LetsRun.com on Thursday. “For me, personally, there’s no amount of, oh, the enormity of my career has to be expressed in this experience. I really don’t feel any of that pressure at all. I’m going to race New York, I’m going to try and beat as many women as possible, and then three steps past the finish line, maybe I’ll start to kind of feel like, oh, I wonder what retirement will feel like.”