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07/20/10 12:50 AM ET

Zambrano throws scoreless inning in Minors

CHICAGO -- Carlos Zambrano struck out one batter in one inning of relief Monday night for the Cubs' Rookie level team in Mesa, Ariz., and his next stop will be Triple-A Iowa.

Zambrano followed starter Jeff Gray, and retired the side in the Cubs' 2-1 loss to the Royals.

Zambrano, who has been on the restricted list following his tirade in the dugout at U.S. Cellular Field on June 25, is expected to pitch for Iowa this weekend in Round Rock and join the Cubs next week during their trip to Houston and Colorado.

He will likely pitch for Triple-A Iowa either Wednesday or Thursday. Cubs roving Minor League pitching instructor Mark Riggins is monitoring Zambrano's workouts.

"Z's basically been feeling good, so we'll see," Cubs manager Lou Piniella said Monday.

The Cubs were expected to make a roster move and add a fresh arm prior to Tuesday's game after having to use three relievers in an 11-5 loss to the Astros.

Brian Schlitter, on the disabled list with right shoulder impingement since July 3, made his first rehab outing Saturday for Triple-A Iowa, throwing one inning. He was expected to throw Monday or Tuesday, then take a day off and pitch two innings. Piniella liked the right-hander's arm during his brief stay with the big league team. Schlitter appeared in only three games for the Cubs from June 28-July 2.

John Grabow, on the disabled list since June 29 with a sprained left knee, was also expected to start throwing and could be back by the end of July. The left-hander is wearing a knee brace during batting practice and workouts.

Byrd, Wells host kids from RBI program

CHICAGO -- About 50 kids from the Boys & Girls Club of Chicago got a taste of big league life Monday.

Cubs center fielder Marlon Byrd and pitcher Randy Wells hosted a clinic at Wrigley Field for the kids, who are part of the "Reviving Baseball in the Inner Cities" (RBI) program. The kids did drills on the field with Byrd, Wells and some Cubs coaches, got a tour of Wrigley Field and then attended the game against the Houston Astros.

Byrd worked on defense, going over footwork and positioning as well as seeing the ball off the bat.

"The guys were pretty good -- they know what they're doing," he said.

The event was the first in a series of clinics through a joint community outreach effort by the Cubs and Steiner Sports. After the kids finished the drills, Byrd flashed his smile and they got to show off.

"After [the drills], we had a little fun and did a little showtime," Byrd said.

One of the kids did a head-first dive, another did a cartwheel and another tried to make a catch behind his back.

Byrd took part in the Boys Club but the emphasis was on basketball. He never had a chance to play on a big league field until he became a Major League player.

"We never did baseball," he said. "Ours was a big basketball camp. Any time we did any other sports, it was just for fun."

'Mystery Ball' on Tuesday to bolster Gulf

CHICAGO -- Cubs infielder Ryan Theriot will do his part to help his native Gulf Coast on Tuesday by hosting a "Mystery Ball."

For $20, fans can purchase a ball autographed by one of the current Cubs players, manager Lou Piniella or Hall of Famer Ernie Banks. Proceeds will benefit the National Wildlife Federation in support of its Gulf Coast relief efforts.

Sales will take place in front of the Wrigley Field gates, so even if you don't have a ticket, you can purchase a "Mystery Ball" or make a contribution. More than 1,000 baseballs will be sold.

Each signed baseball will be placed in a brown bag and distributed randomly at the Wrigley Field gates.

"We hope Cubs fans will embrace this chance to take home an autographed souvenir and help the Gulf Coast relief efforts at the same time," said Theriot, a Louisiana native. "I'm thankful to my teammates for supporting this initiative in an area that means so much to me."

Gates open at 5:05 p.m. CT, and balls will be sold until the third inning or until supplies last.

Extra bases

When the Cubs' Tyler Colvin and Starlin Castro played together in the Minor Leagues, Castro was the leadoff man and Colvin batted second. On Sunday and Monday, Colvin and Castro were Nos. 1-2 in the Cubs' lineup. Manager Lou Piniella said they considered having Castro leadoff. "We figured the two-hole was better for Castro," he said of the 20-year-old shortstop. "Colvin is a college player, more experience. It doesn't really matter, one or two. Castro goes [behind the runner] with the ball. Let's keep it this way for a while and see what happens." On Sunday, the duo was a combined 6-for-9 and scored three runs in Chicago's 11-6 win over the Phillies. ... Bob Brenly was back in the TV broadcast booth after being in Daytona to watch his son, Michael, play for the Class A team. Michael extended his hitting streak to 17 games with a hit Sunday. ... WGN Radio broadcaster Ron Santo will miss the Cubs' upcoming trip to Houston and Colorado. Santo is fine. ... Jeff Baker started at second, his 13th start this season.

Carrie Muskat is a reporter for MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.