One of the things Scott Boras was known to do earlier than other agents was to use sabermetrics and electronic media to make presentations to teams regarding his key clients. In this case, the presentation he made to the Texas Rangers before ultimately getting Tom Hicks to destroy his franchise's future for a decade contained projections of Rodriguez for the ten years of the deal, along with forecasts for Jeter and Garciaparra, then the three best SS in the AL. As we know, Garciaparra's career was derailed by injuries, but the statisticians employed by Boras did an incredible job of nailing the 2010 stats of both A-Rod and Jeter. The only big flaw was the inability to project A-Rod's decline in hitting for average, but the projections are otherwise stunningly good.