Cain, the NL starter in the All-Star game who earlier this season pitched the first perfect game in franchise history, was an easy call for Game 1. Likewise with Bumgarner, the 23-year-old who was second on the team in ERA, strikeouts and innings pitched.
"You look at the years that Matt and Madison have had, that's why they're going Game 1 and Game 2," Bochy said. "We feel like these two have earned these starts and that's why they're out there."
The rest of the rotation is unclear for various reasons.
Zito was one of San Francisco's top pitchers down the stretch to finish with his best season yet since the 2002 AL Cy Young Award joined the Giants. He won his last five starts and seven decisions in the regular season, and hasn't lost since Aug. 2.
More critically for San Francisco, the Giants went 11-0 after Aug. 6 with Zito on the mound. That's vastly different from 2010 when he won only one game over the final two months.
"I'm just happy to be here," Zito said. "Happy to be here, happy to be on the roster, happy to be having fun playing baseball right now. Everything else is gravy."
Lincecum, the Giants former ace who lost 10 of his first 13 decisions this season, rebounded well but still finished with a career-high 15 losses.
The question for Bochy is whether to keep Lincecum in the rotation or put him the bullpen two years after the right-hander pitched the Giants past the Rangers in the Game 5 World Series clincher at Texas.
Vogelsong, 35, would seem the most likely of the three to go to the bullpen. He struggled over the final seven weeks of the season when he had a 6.75 ERA over his final 10 starts.
"We may use Timmy in the 'pen, we may use Vogelsong in the 'pen or Zito," Bochy said. "They'll know exactly what's going on. We'll make sure that they're ready. That's right now what we think is the best way to about it."