Top Prospects: Casey Kelly, RHP, Padres

SAN DIEGO -- Pitcher Casey Kelly, rated the No. 4 prospect in the organization by MLB.com, will appear in an extended Spring Training game Monday in Arizona and if that goes well, he'll head out on a Minor League rehabilitation assignment next week.

Kelly, working his way back from Tommy John surgery on his right elbow on April 2 of last year, threw a side session on Friday. On Tuesday, he threw two innings in an extended Spring Training game.

He's advanced to the point where the organization is comfortable letting him pitch in real games. He will likely do so with Double-A San Antonio.

"If he passes the test Monday, he'll go out on a rehab assignment," said Padres manager Bud Black.

Kelly's rehabilitation from Tommy John surgery has gone relatively well and with few hiccups along the way.

He was scheduled to throw to live hitters on April 5 but told the organization that his elbow was a little sore. But he resumed pitching a few days later.

Kelly hasn't pitched in a real game since making a start for the Padres on Sept. 27 of 2012 against the Dodgers.

Quentin headed to Arizona to continue rehab

SD@TEX: Quentin launches a towering shot to left

SAN DIEGO -- Outfielder Carlos Quentin, who has yet to play in a game because of a bone bruise in his left knee, will head to Arizona on Monday to continue his on-field work as he eyes a return.

The Padres begin a 10-game road trip Monday in Milwaukee, meaning Quentin will head to the team's Spring Training facility to continue his baseball-related activities.

What does this mean for Quentin's potential return to the big leagues?

"That's usually the last step before he's cleared to a rehab assignment," said Padres manager Bud Black.

Quentin has spent much of this home stand taking batting practice on the field before games and doing some shagging of fly balls in the outfield. He has played long toss and has done about everything other than run on the knee.

He suffered the bone bruise making a sliding catch in a Spring Training game on March 18.

"Carlos is doing better," Black said. "He'll continue to ramp up activity and is closer to getting into the full swing of things."

The Padres' offense could certainly use Quentin's bat.

Going into Friday's game, the Padres were tied with the Cubs for the fewest runs scored in the Major Leagues (45).

"Our averages have to come up. You look at our averages as a group … they're well below guys' career averages," Black said after Sunday's 3-1 loss to the Rockies. "We're talking less than 60 at-bats. But we need to elevate those averages."

Rivera impressing on his work with pitchers

Rene Rivera stops by the Padres Social Hour set

SAN DIEGO -- Catcher Rene Rivera made his seventh start of the season Friday against the Giants, which ties him for the team lead with Yasmani Grandal.

Rivera impressed the team with how he worked with pitchers during a 23-game stint with the team a year ago and has done so again during this young season.

Why do pitchers like throwing to Rivera so well?

"I really don't have that answer," Rivera said. "I think they like the way I play my games and that I give 100 percent. Maybe they have a trust in me, how I go about my business, trying to help them.

"It's a good thing. It's a good place to be when all the guys like you and trust you and they like the work you do behind the plate. Hopefully, I can just keep doing what I'm doing."

Pitcher Robbie Erlin had Rivera behind the plate during his victory in Cleveland on April 9. He said that Rivera had a knack of making him feel at ease throughout that start where Erlin allowed one run in six innings with six strikeouts in a victory.

"He really works for the pitchers, you know he's doing everything he can to help you. From a pitchers' standpoint, you get a comfortable level from that, you know it's you two versus the opposition," Erlin said. "He calls a good game, too.

"You know that he's doing everything he can for you, getting you to throw that right pitch, helping you execute it and just making you comfortable so you can do the best job possible."

Rivera has caught all three of Andrew Cashner's starts this season, including his one-hit shutout of the Tigers on April 11.

"I think all our catchers do a great job," said Padres manager Bud Black. "With Rene, he does a nice job instilling confidence in our pitchers, he has a nice rapport with them."

Worth noting

• Infielder Ryan Jackson, who is with Triple-A El Paso, was in San Diego this week to have his sore right wrist examined. Tests revealed that Jackson has a wrist strain. He's on the seven-day disabled list. Jackson, considered a plus-defender at shortstop, can play third base and second base as well.

• Infielder Cory Spangenberg, who is with Double-A San Antonio, landed on the seven-day DL with concussion-like symptoms after sliding head-first in a game Tuesday. Spangenberg, who is considered the Padres' No. 19 prospect by MLB.com, missed six weeks with a concussion in 2012, so the organization opted to err on the side of caution this time around. Spangenberg was hitting .271 at the time of his injury.