Scutaro had started 36 games at the leadoff spot for the Rockies this season, batting .235 with a .295 on-base percentage. In 350 career starts at the top of the order, Scutaro has a .273 average and a .349 on-base percentage.
"He's done so much leading off and he's had success," manager Bruce Bochy said. "I think it's fair to say we've been struggling. We need to get things clicking. Fortunately we have a couple guys who can lead off."
In his third game with the Giants, Scutaro was the fifth leadoff hitter the Giants have had this season, along with Gregor Blanco (65 games), Angel Pagan (25), Nate Schierholtz (7) and Justin Christian (4).
The switch in the lineup came after the Giants were shut out in the last two games of the three-game sweep at the hands of the Dodgers with Pablo Sandoval being sidelined since straining his left hamstring against the Padres on Tuesday.
"We were swinging the bats OK until that [Dodgers] series," Bochy said. "One guy goes down, that affects the club a little bit, but you need to be able to bounce back."
The Giants' four-game losing streak entering Monday matched a season high, and they batted a collective .201 (27-for-134) in that stretch.
"Offensively, we're out of sync right now," Bochy said. "Right now what I want to see is these guys swinging the bats with confidence."