Arrieta's 7 2/3 innings of one-hit ball at Boston capped a 15-13 month for the Cubs, who won only nine games in March and April and 11 in May. This marked their first winning month since going 14-13 in July of 2013, and their 15 wins were their most in a calendar month since posting a 15-10 record in July of 2012.
The Cubs' pitching staff posted a 3.26 ERA in June, the fourth-lowest ERA in the National League. That was their lowest ERA for any month since September and October of 2010, when the pitching staff posted a 3.24 ERA.
Starlin Castro's 21 RBIs in June were tied for fourth highest in the NL. He is only the fourth Cubs' shortstop to drive in at least 21 runs in June. The only other Cubs' shortstops to accomplish this feat in June were
Ernie Banks (26 RBIs in June, 1959 and 32 RBIs in June, 1960), Roy Smalley (25 RBIs in June, 1950) and Shawon Dunston (21 RBIs in June, 1988).
As for Arrieta, he finished June with a 4-0 and 0.92 ERA in six starts. That's the lowest ERA for a Cubs pitcher with at least 35 innings in June since Rick Reuschel had a 0.92 ERA in June of 1977, according to Cubs research historian Ed Hartig.