DENVER (AP) - Kevin Millwood has been a pleasant surprise for the Colorado Rockies.

The Arizona Diamondbacks wouldn't let him be a feel-good story Wednesday night.

Joe Saunders tossed six solid innings, Justin Upton and Miguel Montero homered and the Diamondbacks beat the Colorado Rockies 5-3 on Wednesday night.

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Wilin Rosario, Millwood and Carlos Gonzalez homered for the Rockies.

Millwood signed with the Rockies on Aug. 7 and made his Colorado debut three days later. Entering Wednesday he was 2-1 with a 3.34 ERA in five outings, but his start against Arizona was the toughest in his brief Rockies career.

Millwood (2-2) gave up four runs on 10 hits and struck out four in 5 2-3 innings.

``Of all the starts I've had here, I've felt that it was the worst stuff that I've had,' he said. ``I was able to battle and give us a chance. It just wasn't enough. Nothing was really working that well.'

The task was tough against the streaking Diamondbacks, who have won 13 of 15 and increased their lead in the NL West to seven games over San Francisco.

Colorado had its chances to score but could only produce homers from Rosario, Millwood and Gonzalez.

Millwood's homer was the third of his career and first since May 18, 2002.

``Those are fun. No doubt about it,' he said. `` I wish it could've come in a winning effort. When you only have three you remember.'

Arizona rallied against Millwood to take the lead in the sixth. With two outs, John McDonald doubled down the left-field line to score Paul Goldschmidt from first. Saunders helped his own cause with a single to right to drive in McDonald and give the Diamondbacks a 4-3 lead.

Upton led off the seventh with his 28th homer to make it 5-3.

Colorado took a 3-2 lead in the fourth on Rosario's first career homer - a solo shot.

``My wife gets to keep the ball,' he said.

The Diamondbacks jumped ahead 2-0 in the third on Montero's two-run homer to dead center field, his 15th of the season. The Rockies tied it in the bottom of the inning on solo homers by Millwood and Gonzalez. It was Gonzalez's 25th of the year.

Notes: Rosario's single in the second inning was his first career hit. ... Rockies 1B Todd Helton (back stiffness) sat out his fourth straight game. Manager Jim Tracy said Helton could play Friday. ... Right-hander Jhoulys Chacin will start for the Rockies when they open a three-game series Friday against Cincinnati.