He was much more effective away from home , posting a 1.91 ERA in road games .
However , Grilli heard boos at Comerica Park during the season , mostly due to his home ERA of 7.96 .
Grilli was much more effective away from home , posting a 1.91 ERA in road games .
However , Grilli heard boos at Comerica Park during the season , mostly due to his home ERA of 7.96 .