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3/4/2014 7:35 P.M. ET

MadBum, Vogey continue starters' strong spring

SCOTTSDALE, Ariz. -- Madison Bumgarner and Ryan Vogelsong sustained the precision of the Giants' projected starting rotation in Tuesday's 3-2 Cactus League victory over the Colorado Rockies.

Bumgarner started and worked three shutout innings, continuing to build momentum for his March 31 Opening Night start against the Arizona Diamondbacks. Vogelsong yielded the first run allowed by a Giants starter this spring, but was effective overall as he surrendered one run and three hits in three innings.

In 14 exhibition innings, Bumgarner, Vogelsong, Tim Hudson and Tim Lincecum have allowed eight hits and walked one batter. Their combined ERA is 0.64.

Bumgarner believed that he improved from his Cactus League debut last Friday against Milwaukee.

"My command was better," he said. "Pitches I made from the stretch felt better than they did last time. There still were balls that I left up, but nothing on a regular basis."

Vogelsong was one out away from a scoreless performance before Brandon Barnes singled and scored on Ryan Wheeler's double. Unhappy with his curveball in his previous outing, Vogelsong said that he threw four of them -- "and three were good."

Edwin Escobar, who's deemed closest to reaching Major League maturity among the Giants' starting pitching prospects, threw a scoreless but long seventh inning, explaining why manager Bruce Bochy excused him at that point instead of sending him out for the eighth.

Dunning weathers missed DP to get save

SCOTTSDALE, Ariz. -- The Giants spent Tuesday morning working extra on converting double plays. They proceeded to demonstrate why they needed practice.

San Francisco courted trouble in the ninth inning of their 3-2 exhibition victory over Colorado when first baseman Angel Villalona couldn't hold on to second baseman Nick Noonan's low throw that could have resulted in a game-ending double play.

But reliever Jake Dunning coaxed Cristhian Adames' harmless grounder to first to strand runners on the corners. Manager Bruce Bochy credited Dunning for weathering adversity.

"You try to look at positives, I guess, when you don't turn a double play," Bochy said. "The pitcher has to get some experience getting out of a jam with the game on the line."

Worth noting

• Recovered from a stiff neck that sidelined him Monday, first baseman Brandon Belt returned to the lineup and lashed hits in each of his first two at-bats Tuesday against the Rockies. Belt is batting .600 (6-for-10) thus far in Cactus League action.

• Bochy indicated that left-hander David Huff should be ready to face live hitters soon. Huff has been sidelined with tenderness in his shoulder.

• Bochy said rookie right-hander Clayton Blackburn, whose only game activity was a one-inning intrasquad stint, has experienced back problems but also is getting closer to returning to the mound.

Chris Haft is a reporter for MLB.com. Read his blog, Haft-Baked Ideas, and follow him on Twitter at @sfgiantsbeat. This story was not subject to the approval of Major League Baseball or its clubs.