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07/14/12 9:25 PM ET

Dodgers play matchups with corner infield spots

LOS ANGELES -- As the season enters the second half, the Dodgers are continuing to use a platoon at both corner infield positions in hopes of utilizing the best possible matchups.

On Friday, the team used Juan Rivera at first and Juan Uribe at third. On Saturday, Rivera got the start again while Adam Kennedy started in place of Uribe. Manager Don Mattingly said he expects to go back to Uribe at third on Sunday while playing James Loney at first.

Neither first baseman has stood out through the first half, although Mattingly said Rivera has given more professional at-bats. Rivera entered Saturday hitting .253 with 27 RBIs while Loney was hitting .247 with 24 RBIs.

Third base has been an even bigger problem with Uribe hitting .198 and registering only one hit in his last 20 at-bats.

"I look at third a lot like I do first," Mattingly said. "It's one of those spots where we are trying to find production. I can't say it's going to be anybody's true job over there. We'll just kind of see, and I'm going to mix and match over there."

Dodgers add Wall as Guerra leaves to be with dad

LOS ANGELES -- Dodgers reliever Javy Guerra, who left Saturday to be with his hospitalized father, was placed on the bereavement list and replaced on the roster by pitcher Josh Wall, who was recalled from Triple-A Albuquerque.

Players remain on the bereavement list for a minimum of three days to a maximum of seven days.

Guerra's father suffered a heart attack Friday morning in Nuevo Laredo, a town on the border with Texas near the Rio Grande River, and was scheduled for Saturday surgery.

Guerra returned to the Dodgers on July 5 after missing a month with right knee surgery. He spent Friday figuring out travel and passport details, which is why manager Don Mattingly had mixed feelings about asking Guerra to pitch the seventh inning of a 2-1 win over the Padres after the Dodgers had taken a one-run lead.

"I was a little concerned, honestly, when he gives up that hit," Mattingly said. "I got Josh [Lindblom] up right away."

Wall, a 25-year-old right-hander with a power arm who is ranked No. 16 among the Dodgers' top prospects, has 18 saves but a 5.68 ERA at Albuquerque. He was a second-round pick in the 2005 Draft.

"To me, he's a guy on the move," Mattingly said. "As his confidence grows, he has a chance to be pretty good."

Despite demotion, Herrera valued for his versatility

LOS ANGELES -- Elian Herrera, one of the Dodgers' biggest surprises this season, is back with Triple-A Albuquerque for the start of the second half with Los Angeles needing to make room for a healthy Matt Kemp and Andre Ethier.

For multiple reasons -- including Herrera's options and an inability of finding him many opportunities -- the utility man was the odd man out with Friday's roster moves.

"I love what Elian can do, and I told him when we sent him out," manager Don Mattingly said. "The fact that he can play all over the field, there's a value for him and I think there is a value for him in the future here. You never know, it could be next week, but the way we are situated with the number of outfielders we have and Jerry [Hairston], I don't know where the at-bats were going to come."

Mattingly added Herrera is better off playing every day in Triple-A instead of sitting on the bench waiting for a rare start or pinch-hit opportunity.

Herrera was batting .305 as recently as June 17, but he limped into the break hitting 9-for-64.

John gives MRI of elbow to surgical pioneer Jobe

LOS ANGELES -- It was 38 years ago that Dr. Frank Jobe gave Tommy John a reconstructed elbow, and on Saturday John gave Jobe an MRI of it.

Jobe, who invented for John the operation that grafts an unnecessary tendon to replace a torn elbow ligament, will be inducted into the Baseball Reliquary's Shrine of the Eternals on Sunday and John will make the introduction.

Both were on hand for Saturday's ceremonial first pitch before the Dodgers hosted the Padres.

"After the [1974] surgery, I asked Frank that when my career is over he should put me under and open the elbow and look and see the wear and tear," John said. "He said that was unnecessary surgery. So when I had an MRI of my shoulder after throwing batting practice at age 66, I had an MRI of my elbow and here it is."

John, now 69, unveiled a poster-size montage of an elbow MRI, photos from his playing days, the words John spoke when he agreed to the surgery ("Let's do it") and the fact that he had 124 wins before the surgery and 164 after. He presented a signed copy to the 87-year-old Jobe, who has retired from practice and is a special adviser to the Dodgers chairman.

"This is wonderful," said Jobe, whose first experience with tendon transplants involved polio patients.

The surgery has extended the careers of hundreds of pitchers, as well as some position players, including current Dodgers pitcher Chris Capuano, who had it twice, and Todd Coffey, who will soon have his second.

"[Sandy] Koufax teases me that if I was smart enough to think of it 10 years before, it might have been called the Koufax operation," Jobe said. "He had essentially the same problem."

John was asked if Jobe deserves to be in the Baseball Hall of Fame in Cooperstown.

"I don't see why not," he said. "I think Dr. Jobe is worthy of it. What he's done medically-speaking is as much as a 300-game winner."

Mattingly sees need for change in Derby process

LOS ANGELES -- Dodgers manager Don Mattingly had no problem with Matt Kemp hitting in the State Farm Home Run Derby, but he did have some complaints about how it is set up after watching Robinson Cano get booed in Kansas City.

The fans at the Home Run Derby let Cano hear it for not selecting the Royals' Billy Butler to represent the American League, and Mattingly said he thinks they should remove the captain position due to the abuse Cano received.

"MLB has got to take that off those guys' shoulders and pick the guys or not put it all on one guy," he said. "It's not fair."

The Dodgers' Kemp was the captain for the National League, and the center fielder hit only one home run in the competition.

Ken Gurnick is a reporter for MLB.com. Alex Angert is an associate reporter for MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.