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8/21/2013 3:29 A.M. ET

Carpal tunnel sends Gaudin to disabled list

SAN FRANCISCO -- The diligence that enhanced Chad Gaudin's effectiveness as a pitcher might have contributed to the ailment that sidelined him.

Gaudin went on the 15-day disabled list Tuesday after being diagnosed with carpal tunnel on his right side. Gaudin, whose examination of opponents includes taking copious notes and scrutinizing videos on laptops, admitted that his homework habits may have been a factor in his illness.

"He does a lot of writing, I know that," Giants manager Bruce Bochy said.

Gaudin also cited his transition from relieving to starting, exercising his arm and being hit on his arm by a line drive in a game against Miami on June 20.

"It's not pain, it's not numbness. ... It's lack of control," said Gaudin, who began noticing something amiss almost a month ago. "It didn't feel right. It wasn't able to calm down."

Gaudin, who signed with the Giants in the offseason as a Minor League free agent, emerged as one of the club's most essential pitchers this year. He thrived in relief, then excelled as a starter upon replacing the injured Ryan Vogelsong in San Francisco's rotation. Overall, Gaudin is 5-2 with a 3.06 ERA in 30 appearances, including 12 starts.

Bochy expressed hope that Gaudin, 30, can resume pitching in a couple of weeks. Gaudin himself fully expects to pitch again this season.

"You want to get it calmed down, but at the same time you want to get back out there," he said.

Giants bring back Kickham, Machi to bolster bullpen

SAN FRANCISCO -- The Giants needed pitching help more than they needed outfielder Jeff Francoeur, prompting Tuesday's flurry of roster moves.

San Francisco recalled left-hander Mike Kickham and right-hander Jean Machi from Triple-A Fresno, who began their fourth and fifth Major League stints of the season, respectively. The corresponding moves involved right-hander Chad Gaudin, who went on the 15-day disabled list with carpal tunnel, and Francoeur, who was designated for assignment.

Gaudin's sudden ailment and another rash of bullpen overuse not only led the Giants to bring back Kickham and Machi, but also resulted in a fresh opportunity to start for Barry Zito. The left-hander will face Boston in Wednesday's series finale.

Though Wednesday would have been Kickham's regular day to start, Giants manager Bruce Bochy kept his promise to give Zito another chance. Zito was removed from the rotation Aug. 2, after his record fell to 4-8 with a 5.09 ERA. Since then, Zito allowed six runs in five innings spanning four relief appearances. But he improved in his last two outings, allowing a run in three innings.

"He went to the 'pen and I think he earned this," Bochy said when asked why he selected Zito to start instead of Kickham. "He's a guy who's done a lot for us, if you look at last year. I now it's been an up-and-down year for him, but his stuff, coming out of the 'pen, I think has gotten better."

Kickham was exclusively a starter at Fresno but will be used in long relief at least temporarily. Machi already has made 33 appearances for the Giants, posting a 2-1 record with a 3.34 ERA. Bochy indicated that Jake Dunning and George Kontos also were considered for a promotion, but explained that Machi was the freshest among Fresno's right-handed relief contingent.

Bochy added that Francoeur was crowded out by more than just the pitching additions. Another factor was the impending return of center fielder Angel Pagan, who will advance Friday from the Rookie-level Arizona League to Fresno in his injury rehabilitation assignment. Bochy also noted that the club wants to use its younger outfielders more extensively. Though Bochy declined to name whom he'd like to see more of, the Giants have had Roger Kieschnick and Brett Pill spending considerable time on the bench.

Francoeur, 29, never showed a hint of the prowess he displayed in 2005 with Atlanta, when he finished third in National League Rookie of the Year balloting, or in the next two seasons, when he averaged 24 home runs and 104 RBIs, or even two years ago with Kansas City, when he appeared to revive his career by hitting .285 with 47 doubles and 20 homers. Signed to a Minor League contract after Kansas City released him in July, Francoeur proceeded to hit .194 (12-for-62) in 24 games with no homers and four RBIs.

"We appreciate all he did for us and the fact that he signed with us. He was great," Bochy said of the genial veteran. "In the clubhouse, he had a lot of life. Guys enjoyed being around him. I did. But we just felt like we needed another arm."

Sandoval scratched because of sore back

SAN FRANCISCO -- The Giants scratched third baseman Pablo Sandoval, who was bothered by a sore back, from Tuesday night's lineup against the Boston Red Sox.

Giants manager Bruce Bochy indicated that Sandoval's injury wasn't serious.

"I could have used him [to pinch-hit]," Bochy said after San Francisco's 3-2 Interleague victory.

Bochy said Sandoval would be re-evaluated Wednesday morning before he decides whether to start the two-time All-Star in the series finale.

Plagued by injuries in previous seasons, Sandoval has started 105 of San Francisco's 125 games this year. In his last eight games, the switch-hitter was batting .414 (12-for-29) with seven RBIs.

Shortstop Brandon Crawford, originally slated to bat eighth, occupied the No. 6 spot in the batting order that Sandoval vacated. Joaquin Arias replaced Sandoval at third base, batting eighth. Arias started his 33rd game of the season, including 15 at third base.

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