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5/25/2013 10:13 P.M. ET

Giants torn about whether to start Gaudin

SAN FRANCISCO -- Giants manager Bruce Bochy dropped conflicting hints about the possibility that right-hander Chad Gaudin will replace the injured Ryan Vogelsong for Tuesday's start at Oakland.

Bochy said that he has discussed the issue with Gaudin, whose role as San Francisco's long reliever would enable him to pitch multiple innings.

"So he has kind of an idea," Bochy said.

But Bochy acknowledged that right-hander Santiago Casilla's absence reduces the chances of starting Gaudin, since that would rob the bullpen of another experienced right-hander. Casilla went on the 15-day disabled list last Tuesday with right knee discomfort.

"Chad is so valuable," Bochy said, noting that Gaudin can be used in virtually every bullpen role. "Taking a veteran guy out of your bullpen when you have one that's down already, that's another element [in] the decision-making."

Bochy's expected to name Tuesday's starter on Sunday.

Bochy gets tossed after disputed call at third

SAN FRANCISCO -- An umpire's call that doused a Giants rally in the eighth inning resulted in manager Bruce Bochy's second ejection of the year in Saturday's game against the Colorado Rockies.

With one out, Marco Scutaro at first base and the score tied, 4-4, Pablo Sandoval blooped a single to left-center field. Rockies left fielder Carlos Gonzalez grabbed the ball and threw it to third base, where umpire Alfonso Marquez, who moved from home plate, called Scutaro out.

"That's how he saw it; that's not how I saw it," Bochy said after the Giants rallied to win in 10 innings on Angel Pagan's inside-the-park, walk-off homer. "You can't assume the tag."

Giants third-base coach Tim Flannery and Scutaro vehemently protested the call. Television replays indicated that Rockies third baseman Nolan Arenado missed his attempted tag on Scutaro.

Bochy quickly left the dugout to continue the argument with Marquez. As Marquez returned beind the plate, Bochy paced with him along the third-base line, jawing and gesticulating with each step. Marquez finally tossed Bochy shortly after they reached the home-plate area.

Marquez also made a seventh-inning call that blunted another Giants threat. With runners on second and third and the infield playing in, Brandon Crawford tapped a grounder to second baseman DJ LeMahieu, who threw home. Television replays indicated that Brandon Belt, sliding feet-first, appeared to poke his left leg between Yorvit Torrealba's ankles and scrape home plate before the catcher applied the tag. But Marquez ruled that Belt was out, preserving the 4-4 tie.

Bochy admitted that he couldn't see that play clearly. But, he noted, it underscored the need for video replay on plays at the plate.

"You're going to have calls that you don't agree with or may not be correct," Bochy said. "There's not a lot you can do about it. [The umpires are] human and they're trying to get it right. I know that. But still, it's such a competitive situation, especially in a game like this, where you have some critical calls. You just hope to overcome them. That's what we did."

Pence ranked among best on basepaths

SAN FRANCISCO -- Though no traditional statistics exist for measuring all-around baserunning proficiency, a contemporary formula recently rated Giants right fielder Hunter Pence as the Major Leagues' fifth-best baserunner.

Through last Wednesday, Pence trailed only San Diego's Everth Cabrera, the New York Mets' David Wright, Miami's Juan Pierre and Pittsburgh's Andrew McCutchen in Baserunning Net Gain. It's a metric devised by the famed Bill James that evaluates players based on opportunities to advance on hits and avoid outs on the basepaths. Stolen bases and bases taken on hits or outs are prominent factors measured.

Pence attributed much of his baserunning success to third-base coach Tim Flannery and first-base coach Roberto Kelly.

"They do a really good job of getting me prepared for every spontaneous situation," Pence said Saturday. "They definitely cover every angle."

Pence was 8-for-8 in stolen bases entering Saturday, reflecting his improved speed. That's a difficult physical attribute to upgrade, but it's generally agreed that Pence gained a step or two last offseason.

"I think you can say that I definitely have more confidence in going," Pence said.

Just as importantly, Pence believed that he's getting better breaks from the batter's box or from each base.

"I've never been quick. I've always been fast," Pence said. "But I feel quicker."

This information was used with permission from John Dewan's Stat of the Week.

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