Amanda Animisova after punching her ticket to Saturday’s final. Photo: Robert Prange/Getty Images Every year when the US Open rolls around in August, the discourse begins again in earnest: how long must we wait for an American man to win another Grand Slam? It’s been 22 years now, dating all the way back to Andy Roddick’s triumph at this very tournament in 2003, and still, no one looks particularly close to pulling it off. The almost-insurmountable problem is that doing so would likely require