These showdowns tend to be the province of individual sports. Great team rivalries produce their own sorts of epic narratives. But I'm talking about the sense of total confrontation between two athletes' life experience, craft, endurance, intelligence, anger, joy and will. These absolute clashes of being produce the most exhilarating and chilling moments in sports. Exhilarating because there's nothing like seeing an absolute master tested absolutely. Chilling, because in the inverse, a near-equal genius throws everything on the line and in the end, fails.