An ex-Wall Street trader improved on Moneyball’s famed sabermetrics to place bets that would beat the Vegas odds on Major League Baseball games - with a 41 percent return in his first year. Trading Bases explains how he did it. After the fall of Lehman Brothers, Joe Peta was out of a job. He found a new one but lost that, too, when an ambulance mowed him down. In search of a way to cheer himself up while he recuperated, Peta started watching baseball again. That’s when inspiration hit: Why not apply his outstanding risk-analysis skills to improve on sabermetrics, the method made famous by Moneyball?