Rapid Reaction: Marlins 6, Cubs 2

CHICAGO -- The Chicago Cubs lost a 6-2 decision to the Miami Marlins on Tuesday at Wrigley Field.

How it happened: Edwin Jackson was seeking his first victory since July 31. The 29-year-old starter was 0-3 with a 5.97 ERA in August. (Marlins starter Tom Koehler also had his problems in August, having posted only one victory in the month.) Jackson got out of jams with men in scoring position in four straight innings before giving up a one-out RBI double to Christian Yelich in the fifth. Giancarlo Stanton followed with a run-producing single. Starlin Castro’s error on a routine double-play ball extended the inning, scoring the third run. Jackson was finished after five innings. Koehler imploded in the fifth, giving up a leadoff home run to Brian Bogusevic and walking the bases loaded before getting removed. Anthony Rizzo’s sacrifice fly closed the gap to a single run. The Marlins finished the scoring with three runs in the eighth.

What it means: Jackson (7-15) is winless in his Past six starts. He has averaged 5⅔ innings in his 27 outings. Rookie LHP Zach Rosscup made his major league debut, striking out Chris Coghlan in the sixth (two-thirds of an inning, with a walk and the K).

Outside of the box: Kris Bryant, the Cubs' first draft choice for 2013, was named the organization’s player of the month. Bryant hit seven home runs and drove in 21 runs between rookie league Boise and high Class A Daytona. The 21-year-old third baseman recorded a 1.199 OPS. RHP Pierce Johnson was the franchise’s pitcher of the month. Johnson, 22, was 3-0 in three starts and one relief appearance. He had an ERA of 1.02. … The Cubs added four players from Triple A Iowa. LHP Brooks Raley, Rosscup and RHP Justin Grimm will pitch out of the bullpen. Catcher J.C. Boscan will back up Welington Castillo and Dioner Navarro.

Up next: RHP Jeff Samardzija (8-11,4.13) goes after his ninth win at 1:20 CT Wednesday, as the Cubs try to avoid a three-game sweep against Miami. LHP Brian Flynn will be making his major league debut for the Marlins.