Bour's solo home run in the sixth inning off Cubs starter Jason Hammel snapped a 1-1 tie. That spelled the difference for Koehler (7-4), who allowed five hits and an earned run in his six innings while striking out four and walking one for the Marlins, who have won four straight games.
The Marlins bullpen recorded three scoreless innings to protect the one-run lead. A.J. Ramos pitched the ninth to earn his 13th save in 16 opportunities.
Despite getting little offensive support, Hammel (5-4) nearly matched Koehler's effectiveness. Hammel retired 14 straight hitters in the middle innings before Bour's winning homer.
