"Moneyball" has changed how players are valued, and Beane had begun concentrating on high school players, a group he once largely ignored, in the MLB draft, considering them to be heavily undervalued. He and other like-minded GMs also changed their draft strategies to focus more on defensive skills, which became undervalued in the years immediately after the "Moneyball" revolution. This new emphasis on defense was displayed in the 2010 season; although the Athletics finished at .500 and again missed the playoffs, they led MLB in defensive efficiency, measured as the percentage of balls put into play by opponents that resulted in outs, and allowed the fewest runs in the AL. In the 2012 season the Athletics again made the playoffs under Beane, winning the American League West title on the last day of the regular season. The Athletics returned to the playoffs in 2013 by winning the American League West division title again, the team's first back-to-back division championships since the 2002 and 2003 seasons.