He is working because he does good work. This was the 9th time he faced SF this season and he had given up 1 run before this. 3 ERA for the season and they have won 33 of the games he pitched in
He's 41 and can still hit 95 to 96 on the gun. With the Rockies really poor bullpen he's generally been terrific. He's got a 3.00 era in 49 games with only 2 blown saves and given up only 2 home runs.
