Casey Schmitt hit a leadoff homer to spark a four-run ninth inning, and the San Francisco Giants rallied to beat the Colorado Rockies 6-5 in Denver on Tuesday night.

Willy Adames also went deep and Wilmer Flores had two hits for San Francisco, which has won a franchise-record six straight games by one run — the first team to do that since the 1989 California Angels.

The Giants trailed 5-2 entering the ninth but Schmitt’s first home run of the season started the rally. Zach Agnos (0-3) walked the next two batters and, after a forceout at third, walked Adames to reload the bases.

Heliot Ramos’ sacrifice fly off Victor Vodnik made it 5-4, and Flores and Mike Yastrzemski hit RBI singles to put San Francisco ahead.

Erik Miller (3-0) got one out for the win and Camilo Doval navigated a shaky ninth to earn his 10th save.

Ryan McMahon and Kyle Farmer homered and Brenton Doyle and Hunter Goodman had two hits each for Colorado, which dropped its fourth straight.

The Giants took the lead in the first inning when Jung Hoo Lee led off with a triple and scored on a sacrifice fly by Adames.

Colorado tied it in the second. Doyle doubled with one out, and after starter Kyle Harrison fanned Keston Hiura, Ritter singled to center to bring home Doyle.

McMahon gave Colorado a lead with a solo homer in the fourth, and Adames tied it in the fifth with his sixth homer of the season. Rockies starter Carson Palmquist left after issuing a walk to Ramos, but Jake Bird struck out the next three batters to keep it 2-2.

Palmquist allowed two runs on four hits and walked three in four innings while Harrison gave up three runs on four hits and struck out six in five innings.

Farmer’s two-out homer in the fifth put Colorado back in front.

Colorado padded its lead in the eighth. Goodman tripled with one out and scored on Thairo Estrada’s groundout. After McMahon walked, Doyle tripled to center.

–Field Level Media