White Sox pitcher David Riske was suspended three games by the commissioner's office Thursday for intentionally throwing at the Cardinals' Chris Duncan this week. White Sox manager Ozzie Guillen also was suspended, for one game. He and Riske were each fined an undisclosed amount by Bob Watson, vice president of on-field operations for Major League Baseball. Riske's suspension was scheduled to start with Thursday night's home game against the Cardinals, unless the reliever appeals. Guillen was required to serve his penalty Thursday.