Fox went hitless, but his two-out walk was the third straight pass given up by losing pitcher Mark DiFelice (4-1), who also threw a wild pitch before walking Fox.
Starter Carlos Zambrano knocked in the other run with a fifth-inning single, while Ryan Theriot, Koyie Hill and Mike Fontenot all had two hits for the Cubs, who have won the first two contests in the four-game weekend series.
They won Thursday's opener 9-5 when first baseman Derek Lee homered twice,
including a grand slam, and drove in a single-game career-high seven runs.
The winner was closer Kevin Gregg (3-2), Chicago's third pitcher.
Milwaukee's run scored on Corey Hart's fourth-inning bases loaded walk against Zambrano.
Six batters had one hit for the Brewers, who have lost five of eight against the Cubs this season.
Copyright 2009 by United Press International.
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