DENVER -- Colorado manager Walt Weiss did not want to use closer Rafael Betancourt on Sunday because he had pitched in the Rockies' previous four games in a five-day stretch.
So Weiss turned to Wilton Lopez, who had 10 saves for the Houston Astros last year, and the move backfired. The Arizona Diamondbacks scored two runs in the ninth inning to beat the Rockies 5-4 and end Colorado's eight-game winning streak.
The loss was also the Rockies' first at home after a franchise-record eight straight wins to begin the season.
The Rockies had to rely more on their bullpen than they have recently, after receiving at least six innings from their starters in each of their past three games and wins in six of the previous seven games.
But starter Juan Nicasio was unable to last five innings, done in more by a mounting pitch count that reached 96 when he departed after 4 1/3 innings.
Lopez had pitched better recently after several shaky outings but gave up a single to Arizona leadoff hittter Didi Gregorious in the ninth. A.J. Pollock hit a high bouncer that went over the head of third baseman Jonathon Herrera and landed in short left field for a double. Pinch-hitter Alfredo Marte hit a bouncer that Herrera charged. He thought about trying to throw home to get Gregorious but took the sure out at first. Gerardo Parra followed with a sacrifice fly to deep center.
The Rockies had a shot to tie the score in the ninth or win it against closer J.J. Putz. Pinch-hitter Dexter Fowler walked with one out and took off for second on a 2-and-1 pitch with two out to Josh Rutledge. Fowler scampered to third on the hit, but Eric Young Jr. bounced back to Putz to end the game.
The Rockies won the first two games of this series 3-1 and 4-3 with a home run in each game. They did get a home run in the series finale, a solo shot by Troy Tulowitzki leading off the sixth against Diamondbacks starter Brandon McCarthy. Tulowitzki's sixth homer of the season gave the Rockies a 4-2 lead and boosted his RBI total to 17, tying his career high in April.
NOTES: Betancourt is 7 for 7 in save opportunities this season. ... Rockies pitcher Jhoulys Chacin (back strain) was placed on the disabled list retroactive to Saturday and will undergo an MRI on Monday. Reliever Rob Scahill, who had a 1.04 ERA in six September appearances for the Rockies, was recalled from triple-A Colorado Springs, where he is 2-0 with a 4.26 ERA in five games. Chacin left his start Friday after 6 1/3 scoreless innings when he threw his 100th pitch and felt back pain. He will miss at least two starts. ... Rockies center fielder Dexter Fowler was not in the lineup. He was hit in the right hand with a pitch in the third inning on Saturday night but stayed in the game. One week ago in San Diego, he fouled a ball off his left foot. Fowler has one hit in his past 15 at-bats, but manager Walt Weiss said he wanted to rest Fowler because he had been getting "dinged up" and not because of how he was hitting. ... Rockies first baseman Todd Helton was not in the lineup for the second straight game because of a left forearm strain. ... Gregorious was back in the lineup after not playing Saturday night. Gregorious was on the disabled list until April 16 with a right elbow strain and manager Kirk Gibson said he didn't plan on playing Gregorious three straight games because "he's back, but on the back end of his rehab. I don't want to play him every day. That wouldn't be smart." Gregorius made his major-league debut Thursday night at Yankee Stadium.