Rapid Reaction: Rockies 4, Cubs 3

DENVER -- A quick look at the Chicago Cubs' 4-3 loss to the Colorado Rockies on Sunday at Coors Field.

How it happened: Edwin Jackson, who had won three straight and shut out the Cardinals for seven innings in his previous start, got off to a shaky start Sunday, giving up two first-inning runs. Colorado’s Carlos Gonzalez and Matt Cuddyer contributed with RBI hits. Jackson settled down nicely, retiring the next 13 of 14 through the fifth inning. The Cubs got on the board thanks to a leadoff home run from Anthony Rizzo in the sixth. Rizzo took Colorado starter Tyler Chatwood deep to the opposite field for his 14th of the season. A Darwin Barney sac fly later that inning got Jackson and his team back to even. But Junior Lake's second costly error in centerfield in two days allowed a second run to score in the Rockies’ half of the inning. Jackson had walked two after getting the first two batters out. The Cubs were 0-for-6 with runners in scoring position through seven innings.

What it means: Jackson took his first loss since June 25 and the Cubs lost their first series since July 2-4 at Oakland, where they lost two of three. The Cubs are 5-2-2 in their last nine series. Lake has hit well, but his defense has cost two unearned runs in two days. Starlin Castro delivered four hits in five at-bats, tying his career high.

Outside the box: Cubs manager Dale Sveum said he is 100 percent sure Matt Garza, the subject of many trade rumors, will pitch for the Cubs in Phoenix Monday evening. … Minor league pitchers Chris Rusin and Brooks Raley are considerations if Garza is moved. “We have nobody on his way,” Sveum said before Sunday’s game.

Up next: Matt Garza (6-1, 3.17 ERA) surprisingly is still a Cub and is scheduled to pitch Monday night. He will face the Diamondbacks and Tyler Skaggs (2-1, 4.09.)