He had never done it before that season .
On August 14 , Lester struck out ten batters for the sixth time in the 2009 season , the most times ever by a Red Sox left - handed pitcher .
Lester had never done Red Sox before that season .
On August 14 , Lester struck out ten batters for the sixth time in the 2009 season , the most times ever by a Red Sox left - handed pitcher .