Sheets is 6-and-3 after giving up seven hits while striking out seven. Francisco Cordero completed the combined nine-hitter for his 21st save.
The Brewers prevented Dontrelle Willis from becoming the National League's second eight-game winner. Prince Fielder and Johnny Estrada hit R-B-I singles off Willis, who is 7-and-4 after giving up two runs and seven hits in six innings.
The Brewers improved to 26-and-13 versus teams currently under .500.