I was working on this, and McTaggart beat me to it. A comparison of Clark and Pedrique.
Made managerial debut in 2003 at Class-A Lynchburg in Carolina League and was named league's Manager of the Year. In 2004, he managed at Class-A Hickory in the Pittsburgh organization and went 85-55 and won the South Atlantic League title. The Astros hired him in 2005 and he managed for three years at Double-A Corpus Christi, leading the Hooks to the 2006 Texas League title and winning Manager of the Year honors. He managed at Triple-A Round Rock in 2008 and went 64-79.
Al Pedrique, notably:
He managed for eight years in the Minors, posting back-to-back winning seasons in 2002-03 at Double-A Tucson in his final two seasons as skipper. He began managing in 1995 and guided the Astros' Class-A affiliate in Michigan in 1999-2000, winning the Midwest league title in 2000. He's also managed in the Venezuelan Winter League and the Arizona Fall League.