Arrieta pitched on Wednesday night, allowing 11 hits and eight runs (seven in the first inning alone) in four innings of the Cubs’ 10-0 loss to the Milwaukee Brewers to fall to 5-11 with a 6.88 ERA this season. Arrieta dropped his seventh straight decision and since his last win on May 25 he has a 9.92 ERA in 11 starts.
He returned to the Cubs this season with a one-year deal after spending the past three seasons with the Philadelphia Phillies.
Arrieta, 35, starred for the Cubs from 2013 to 2017, winning a Cy Young Award in the 2015 season and helping the team to three playoff appearances and a World Series championship in 2016. In the 2015 and 2016 seasons, he threw two no-hitters and won 40 games.
Arrieta signed a three-year deal with Philadelphia before the 2018 season, but injuries marred his tenure there.
He is 115-90 with a 3.93 ERA in 12 major league seasons.
The Cubs also placed starting catcher Willson Contreras on the 10-day injured list Thursday with a sprained right knee.