SAN DIEGO -- Padres second baseman Orlando Hudson is headed to the 15-day disabled list with a strained right hamstring, though he tried his best to convince his manager, Bud Black, otherwise on Wednesday.

"He pleaded his case. But at the end of the day, this is probably the right thing to do," said Black.

Hudson suffered the strain in the first inning on Tuesday, when he doubled to center field. He thought the injury might have occurred as he was starting to make a push for a triple.

"I was going three [triple] out of the box," Hudson said. "When I hit a ball in the gap like that, I'm always thinking three."

Hudson said on Wednesday that his hamstring was feeling better, though the severity of the strain led the Padres to take the cautious route.

"With the history of hamstrings, it was probably going to be seven to 10 days before he could play at a level you need to play at," said Black. "Even with that, the risk factor of re-injuring it is high. We felt we did the thing that made the most sense."

Hudson was on the 15-day disabled list in 2004 with a left hamstring strain while he was a member of the Blue Jays.

The Padres purchased the contract of second baseman Logan Forsythe from Triple-A Tucson before Wednesday's game against the Pirates. Forsythe was in uniform for the game.

Eric Patterson got the start at second base in the series finale.

Healthy Johnson mobile behind plate

SAN DIEGO -- On at least three occasions on Tuesday, Padres catcher Rob Johnson shifted quickly out of his stance to block breaking balls in the dirt on strikeouts, recovering fast enough to make the throw to first base to complete the out.

"I had a lot of balls in the dirt," Johnson said. "I wasn't able to move like that last year."

That's because Johnson, who was playing for the Mariners last year at this time, said that he rushed back too quickly from separate surgeries to repair labrum tears in both of his knees in October of 2009.

Johnson lacked the mobility to get out of his catching stance quickly a year ago, a result of a recovery period that lasted four months instead of the customary eight.

Johnson was traded to the Padres in December and on Tuesday, he might have enjoyed his best day -- hitting the go-ahead home run to left field in the eighth inning of a 6-5 victory over the Pirates, as well as handling those tough breaking balls in the dirt.

In the fifth inning, Mat Latos struck out Xavier Paul on a slider in the dirt with Johnson blocking down on the ball and then throwing to first base for the out. Then in the eighth inning, Mike Adams struck out Garrett Jones on a curveball in the dirt. Johnson blocked the ball and finished the out.

The ninth inning proved big for Johnson, who threw out Brandon Wood as he attempted to advance to third base on a curveball by Heath Bell that momentarily trickled away from Johnson. He grabbed the ball and threw a strike to Chase Headley at third base for the out.

"He got rid of it quick," Headley said. "He threw that ball right where he needed to throw it."

Johnson credits his health and his work with special assistant Brad Ausmus on blocking in Spring Training.

"I'm feeling great now," Johnson said.

Johnson was asked after the game which was a better moment for him on Tuesday, the home run or throwing Wood out at third base.

"Definitely, the throw," he said, smiling. "We needed that. Chase really picked me up. But as a catcher, I get a kick out of throwing guys out."

Padres add infielder Forsythe

SAN DIEGO -- Logan Forsythe had but one thought when he was summoned back to the dugout from the on-deck circle on Tuesday in Tacoma, where he was playing for the Triple-A Tucson Padres.

"I thought I did something wrong," he said.

Soon enough, Forsythe discovered otherwise -- as his manager, Terry Kennedy, extended his hand to the second baseman to congratulate him on his impending promotion to the big leagues.

"The team was grouped at the end of the dugout, and [Kennedy] stuck out his hand and said, 'Congratulations,'" Forsythe said. "It was pretty cool."

Forsythe was in uniform for Wednesday's game against the Pirates after taking a morning flight from Sea-Tac Airport to San Diego, as the Padres added him to the 40-man roster to replace second baseman Orlando Hudson, who suffered a right hamstring strain in the first inning of Tuesday's game.

Also, the Padres moved left-handed pitcher Joe Thatcher from the 15-day disabled list to the 60-day DL to create a spot on the 40-man roster for Forsythe.

Forsythe was hitting .291 with Tucson, with nine extra-base hits and 15 RBIs in 22 games.

"He has had good at-bats in the early part of the season," San Diego manager Bud Black said. "He had a lot of at-bats this spring. He's very comfortable with what we're expecting out of him."

Eric Patterson got the start at second base on Wednesday, but Forsythe was in uniform and available to play.

Forsythe was drafted as a third baseman, but made the move across the diamond during Spring Training in 2010. He's still picking up the nuances of the position, like footwork and starting double plays.

"It's going well. I'm being more aggressive [at the plate]. I'm striking out a little more than I wanted," said Forsythe, who has 28 strikeouts in 86 at-bats.