ARLINGTON -- The end of the month can't arrive soon enough for Twins pitcher Carlos Silva.

The Venezuelan right-hander lost his fourth consecutive start Monday when the Texas Rangers smacked him around for seven runs in 4 1/3 innings of an eventual 14-4 rout before 24,814 at Rangers Ballpark in Arlington.

"Obviously, we didn't pitch," Twins manager Ron Gardenhire said. "And when you don't pitch, you don't win. We played way too much defense tonight, and not enough offense."

After waiting out a 28-minute rain delay before the first pitch, the Rangers scored in each of the first six innings, including a season-best eight-run outburst in the fifth. They sent 12 men to the plate that inning, which included Sammy Sosa chasing Silva (2-5) with a two-run double and Twins rookie reliever Julio DePaula giving up catcher Gerald Laird's first career grand slam.

DePaula, who pitched a scoreless inning in his big-league debut last Wednesday in Cleveland, gave up seven runs (six earned) in his one-inning stint Monday.

"Carlos left too many pitches up in the zone, and DePaula had a really tough time and didn't really give us much," Gardenhire said. "Obviously, we're going to have to find some pitching here real soon."

The urgency grew after the Twins lost a member of their bullpen for the third time in six days.

Glen Perkins followed the injury leads of Jesse Crain and Dennys Reyes when he strained a muscle near his left shoulder blade throwing a sinker that struck out Frank Catalanotto in the bottom of the eighth.

Perkins called it the best pitch he threw all night, but it will also be the last pitch he throws for at least two weeks. That was the minimum recovery time projected by Rangers team physician Dr. Keith Meister, who examined Perkins after he dropped his glove and left the game. Perkins is expected to land on the 15-day disabled list Tuesday.

"I guess I just pulled something," Perkins said. "I'm just relieved it's not something like a shoulder or an elbow. I threw a sinker in, and it felt like a muffled cracking sound. I guess the rest is history."

Crain went on the disabled list Wednesday with an injured right shoulder, and has been scheduled for season-ending surgery next Tuesday.

Reyes underwent an MRI exam of his sore shoulder Monday, and learned after the game that he has degeneration of his left rotator cuff and labrum, but no significant tear. Still, he is expected to be unavailable for at least three more days.

That left Perkins as the lone left-hander in the Twins' bullpen, but he will be replaced on the roster Tuesday.

"It does make the situation a little more dire here for the next two days," Gardenhire said. "Two people down in the bullpen? That's a little shaky."

Especially against a team swinging the bats with the ferocity of the Rangers, who also scored 14 runs to win Sunday in Houston. This was the first time Texas scored 14 runs in back-to-back games since July 31-Aug. 1, 2002, when the Rangers thumped the Yankees (17-6) and Red Sox (19-7) on consecutive nights.

The game had a promising start for the Twins (20-24), who took a 1-0 lead while making Rangers starter Vicente Padilla (2-6) labor through a 31-pitch first inning.

But Silva gave up a run-scoring double to Sosa in the bottom of the first and a leadoff homer to Catalanotto in the second, and Minnesota never led again. Catalanotto had just come off the disabled list, but homered off Silva in his first Major League at-bat since April 30.

After breezing through April (2-1, 3.10 in five starts), Silva is 0-4 with a 6.17 ERA through his first four starts in May. He sustained hard-luck losses to the Red Sox (2-0) and White Sox (3-0), but was punished by the Indians (7-1) and Rangers.

Texas came into this series opener with six Opening Day players on the disabled list and a winning percentage of .386, tied for 27th among the 30 Major League teams. But after seeing their 14-1 rout of the Astros on Sunday, Gardenhire was wary about catching the Rangers at the wrong time.

"I know this club is beat up a little bit, but this club can score," he warned. "This is always a tough place to win baseball games."

The pregame warning proved prophetic. Silva was knocked out with his shortest outing since a four-inning start against Kansas City last Sept. 27, and DePaula appeared overmatched by the free-swinging Rangers.

"He didn't throw it over enough," Gardenhire said of the rookie right-hander, "and when he did throw it over, they whacked it. It was just a rough night for him."

The only positive for the Twins was seeing second baseman Luis Castillo play his 130th consecutive game without an error, certified Monday by the Elias Sports Bureau as a new Major League record for his position. The Chicago Cubs' Ryne Sandberg held the mark previously with 123 consecutive errorless games at second.

"That's who I followed when I was a little kid," Castillo said. "Ryne Sandberg was the reason I play second base. That [record] surprises me, but I feel proud."

Castillo is within a week of the one-year anniversary of his last fielding error. It came May 29, 2006, a span of 594 total chances ago and counting (also a record).

"I want to see it happen first," he said.