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BALTIMORE — Chris Tillman has been so good this season, it's rather surprising when the BaltimoreOrioles right-hander performs poorly — especially at home.

Seeking his major league-leading 15th win, Tillman lasted only five innings in a 6-3 loss to the Colorado Rockies on Tuesday night that ended Baltimore's five-game winning streak.

In his previous four starts, Tillman (14-3) gave up a combined four runs over 28 innings. In this one, he allowed six runs and nine hits.

"Just a reminder of how hard it is to do what he's been doing," manager Buck Showalter said.

After Tillman retired six of the first seven batters, Carlos Gonzalez and Trevor Story had two RBIs apiece in a four-run third inning. Tillman ended up using 89 pitches to get 15 outs.

"We were patient," Gonzalez said. "We had some really good at-bats against him. We know what kind of pitcher he is. He is having a tremendous year, especially here at his park."

Tillman was 8-0 at home this season, and Baltimore was unbeaten in his 12 starts at Camden Yards.

So what made this start so much different?

"I think the ball just fell where we weren't," Tillman insisted.

After Colorado loaded the bases with one out in the third, Tillman retired Nolan Arenado on a foul popup and was within a strike of getting out of the jam when Gonzalez lined a double into the left-field corner. Story followed with a two-run single for a 4-0 lead.

"We had the two big at-bats with Cargo and Story. Both with two outs and two strikes," manager Walt Weiss said. "Those two at-bats were crucial in the game."

Arenado picked up his 78th RBI with a double in the fifth and came home on a wild pitch.

Adam Jones hit his 18th homer for Baltimore in the bottom half.

The Orioles still own baseball's best home record at 37-15, including 21-4 since the beginning of June.

Chad Bettis (9-6) won his third straight start, allowing two runs, four hits and three walks in six innings. Colorado is 8-1 in his last nine outings.

"They have a lot of guys who can slug it," the right-hander said. "You just have to try to work in and out effectively. If you leave the ball up, stuff like the Jones' home run happens."

Rookie Carlos Estevez got three outs for his ninth save.

The surging Rockies have won five of six and are 8-4 since the All-Star break.

"I've been telling the club all year I felt we were going to get better and better as the year goes on," Weiss said. "That hasn't been our history the last few years."

SKIDDING DAVIS

Orioles first baseman Chris Davis went 0 for 3 with two strikeouts and is 0 for 24 with four walks and one RBI since July 17.

"He's going through a period where he's not — stating the obvious — doing what he's capable of," manager Buck Showalter said. "He'll get it going."

TRAINER'S ROOM

Orioles: OF Hyun Soo Kim (hamstring) was activated off the DL and RHP Ubaldo Jimenez returned from paternity leave. ... Top pitching prospect Hunter Harvey had Tommy John surgery on Tuesday. The 21-year-old was the 22nd overall pick in the 2013 amateur draft.

UP NEXT

Rockies: In the series finale Wednesday night, Jon Gray (6-4, 4.12 ERA) seeks his first road win in five tries since June 5.

Orioles: Rookie Dylan Bundy (3-2, 3.30) tries to build on his first career win as a starter. He gave up one unearned run in five innings against Cleveland on Friday.

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