The Cubs tied a franchise record for hits allowed, matching Sept. 2, 1957, when they lost to the Milwaukee Braves.
After scoring two runs in a three-game series against Houston, the Brewers broke out against an overmatched pitching staff.
Ryan Braun also had five hits for Milwaukee, which snapped a five-game losing streak. Casey McGhee had a three-run homer and Fielder had a three-run double.
Corey Hart finished with four hits for the Brewers.
Gallardo (10-5) allowed one run and two hits over six innings.
The Cubs have lost a season-high six straight and have been outscored 62-17 in that span.
Chicago finished with four hits, all doubles.
At St. Louis, Jeff Keppinger had two hits and four RBIs, including a key hit during a go-ahead three-run eighth inning, and Houston won its sixth straight and spoiled Jake Westbrook’s St. Louis.
Albert Pujols homered for the third straight game and Westbrook worked six strong innings for St. Louis, which lost for only the second time in 13 home games. The Cardinals have lost four straight at home to Houston, falling a half-game behind Cincinnati in the NL Central.
Keppinger’s RBI double off Mike MacDougal (1-1) tied it at 4 and Carlos Lee scored the go-ahead run by beating a wide throw home from second baseman Skip Schumaker on Chris Johnson’s bases-loaded chopper.
Nelson Figueroa (3-1) allowed an RBI double by Felipe Lopez that put the Cardinals ahead 4-2 in the seventh.
Westbrook, acquired in a three-way deal last week, had seven strikeouts, one off his season high.
At Pittsburgh, rookie Travis Wood allowed two singles over seven innings and fill-in first baseman Miguel Cairo drove in two runs for Cincinnati, which moved into first place in the NL Central.
Russ Springer , the 41-year-old right-hander brought up from the minors earlier in the day, and Arthur Rhodes , the 40-year-old first-time All-Star, pitched an inning each to complete the combined three-hitter — Cincinnati’s seventh shutout and fifth victory in six games.
The Pirates, on pace for their record-extending 18th consecutive losing season and their first 100-loss season since 2001, have been outscored 34-5 while losing their last five.
Wood (2-1) had made only six previous career starts, winning once.
Cairo, filling in for NL RBIs leader Joey Votto , who sat out with a sprained right wrist, had a sacrifice fly in the fourth.
Russ Ohlendorf (1-9) walked four and hit a batter over five innings.
At Atlanta, Tim Hudson pitched six solid innings and Rick Ankiel drove in two runs with his first hit for Atlanta.
Ankiel’s two-out, two-run single came in a three-run first inning.
Chipper Jones added a solo home run in the seventh — his eighth — for the Braves, who had lost five of seven and two straight.
The Mets lost their second straight and 10th in 14, and have won only six of their last 23 games.
Hudson (12-5) allowed six hits, one run, walked three and struck out three.
Johan Santana (8-6) gave up nine hits, four runs, walked two and had a season-high 11 strikeouts in seven innings.
Billy Wagner pitched a scoreless ninth to earn his 25th save in 30 opportunities.
At Phoenix, Adam Dunn hit his 26th homer and Livan Hernandez baffled hitters into the eighth inning for Washington.
Ivan Rodriguez became the fifth catcher to hit 300 homers with a solo shot off Rodrigo Lopez (5-10) in the second, and Dunn hit another into the swimming pool in right-center the next inning.
Hernandez (8-7) kept the Diamondbacks off balance with a curveball that barely cracked 60 mph at times. He allowed one run and five hits over 7 1-3 innings.
Sean Burnett got the final five outs for his first save since closer Matt Capps was traded.
Rodriguez led off the second inning with his second homer of the season to join Mike Piazza, Carlton Fisk, Johnny Bench and Yogi Berra in the catchers’ 300 club.
At Los Angeles, Chase Headley had four hits, including a three-run homer, and Will Venable homered and drove in four runs for San Diego.
Clayton Richard (9-5) allowed four runs and 10 hits over 5 1-3 innings and struck out six.
The Padres increased their division lead over the idle San Francisco Giants to two games with their seventh victory in 10 games. The fourth-place Dodgers, whose sixth straight loss tied their longest skid this season, are a season-worst nine games off the pace after winning the last two division titles.
Matt Kemp had a career-high five hits, including a solo homer and two RBI singles, for the Dodgers.
Hiroki Kuroda (8-10) was charged with five runs — four earned — and seven hits over four innings. Dodgers starting pitchers had a 1.81 ERA over the previous 15 games.
