Cubs select left-hander Ryan Borucki, option Caleb Kilian before series finale vs. Marlins

John Antonoff / for the Sun-Times

Cubs left-hander Ryan Borucki posted a 3.52 ERA in spring training.MIAMI — The Cubs selected Ryan Borucki from Triple-A Iowa on Sunday, giving them a lefty in the bullpen before the series finale against the Marlins. In a corresponding move, they optioned Caleb Kilian to Triple-A after his spot start the day before.

The Cubs signed Borucki to a minor-league contract with a major-league spring training invite this offseason. He posted a 3.52 ERA in spring and was competing for an Opening Day roster spot.

“The 26 men that start on the opening roster are not the only 26 men that are going to help that team win,” Borucki told the Sun-Times this spring. “And you…