ST. LOUIS — The St. Louis Cardinals and rookie second baseman JJ Wetherholt have agreed to an eight-year, $112.5 million contract extension, a deal that keeps one of the club’s rising young players in St. Louis for the long term.The agreement, reached as the Cardinals entered the weekend three games out of a National League wild-card spot, buys out Wetherholt’s first several years of free agency. The move also shows a bold change in the Cardinals' personnel decisions in recent ...