The twin-killing lifted the Eagles to 14-8 for the campaign.
Zion Pettigrew continued his hot hitting for Kirkwood by going 3-for-4 with a home run and three RBIs in the 13-3 victory, which ended in the bottom of the sixth by the mercy rule when the Eagles scored seven runs.
Lecari Elion allowed three runs in five innings in the opener for the victory.
Pettigrew, Usher and Jackson belted home runs in the 11-10 victory in the nightcap. Usher was 3-for-4 with two runs and two RBIs. Jackson was 2-for-4 with two RBIs. Pettigrew and Austin Krob scored twice.
Kirkwood built an 11-1 lead after four innings and held on for the 11-10 victory when Marshalltown scored nine runs in the last three innings.
Marshalltown 001 020 - 3 7 x
Kirkwood 000 337 - 13 12 0
Elion, Frese (6) and Vaske. W - Elion (2-0). 2B - Jackson, Pettigrew, Bennett. HR - Pettigrew. RBI - Usher, Jackson 2, Pettigrew 3, Youngquist, Vaske, Bennett 2, Brister 2. SB - Kerr.
Marshalltown 001 042 3 - 10 8 x
Kirkwood 127 100 x - 11 6 1
Fuller, Mann (4), Loston (5), Kerr (5), Givens (6), Bennett (7) and Vaske. W - Fuller (1-0). HR - Usher, Jackson, Pettigrew. RBI - Usher 2, Jackson 2, Pettigrew, Vaske, Brister. SB - Usher.