CINCINNATI -- Home runs by Brandon Phillips and Todd Frazier helped rookie left-hander John Lamb earn his first career victory as the Cincinnati Reds defeated the St. Louis Cardinals 11-0 to begin a four-game series Thursday night at Great American Ball Park.

Phillips' homer in the seventh epitomized the evening for the Cardinals -- the ball caromed off right fielder Jason Heyward's glove, then over the wall for a solo homer.

Later in the seventh, former Cardinal Skip Schumaker drove in two runs with a pinch-hit double to center, making the score 9-0.

Frazier went 3-for-5 with a double, three runs and three RBIs. He hit his 32nd homer, a two-run blast in the eighth.

Lamb (1-3) threw five shutout innings during his sixth career start since being acquired from the Kansas City Royals in the Johnny Cueto trade.

Cardinals lefty Jaime Garcia (8-5) took his first defeat since July 28, which also came against Cincinnati.

First-place St. Louis (88-52) grounded into three double plays. The Cardinals have been outscored 38-10 in their past five games.

Lamb had command issues from the outset. He walked the first two batters he faced and six total. He had six strikeouts and surrendered only three hits.

Four Reds relievers threw one scoreless inning apiece to complete the shutout.

Lamb's bases-loaded grounder in the second inning put Cincinnati ahead 1-0. It was the pitcher's first career RBI. Phillips' third-inning RBI groundout doubled the lead.

St. Louis let Lamb off the hook in the third when third baseman Mark Reynolds fanned with the bases loaded.

Cincinnati (58-81) pushed the lead to 6-0 with a four-run fifth against Garcia. First baseman Joey Votto and Frazier hit RBI doubles, with Frazier becoming the fourth Reds player ever to have 40 doubles and 30 homers in a season.

Phillips and right fielder Jay Bruce -- the latter off left-handed reliever Randy Choate -- added sacrifice flies.

Garcia was charged with six runs in 4 1/3 innings. He walked four, allowed six hits and struck out two.

NOTES: Reds 1B Joey Votto refused to speak with reporters Thursday regarding his ejection in the eighth inning of a 5-4 loss to the Pirates on Wednesday, saying only that he hadn't heard from the league regarding disciplinary action. Votto slammed his helmet to the ground and had to be restrained after home plate umpire Bill Welke denied his request for time before a 1-1 pitch, which was called a strike. ... Reds manager Bryan Price said C Brayan Pena would be limited for a few days after leaving Wednesday's game in the eighth inning with a strained right hamstring. ... Cardinals CF Randal Grichuk was not in the lineup. He is swinging a hot bat, as evidenced by his 451-foot homer on Tuesday, but he's still unable to make throws to the infield after missing 18 games with an elbow injury.