The Pittsburgh Pirates are set to return a key piece of their lineup after previously placing Ryan O'Hearn on the 10-day injured list with a left quad strain.Per an announcement from the Pirates, they've activated first baseman Spencer Horwitz from the 10-day IL while also activating right-handed reliever Camilo Doval to the 26-man roster after acquiring him in a trade with the New York Yankees on August 1.As the corresponding moves, Pittsburgh optioned right-handed reliever Isaac Mattson and outfielder Billy Cook to Triple-A Indianapolis.We have made the following roster moves: pic.twitter.com/uYWOxvepNo— Pittsburgh Pirates (@Pirates) August 2, 2026Horwitz's return comes at the perfect time, as the Pirates won't have to rely on a patchwork of first basemen in O'Hearn's absence.In 74 games and 295 plate appearances this season, Horwitz has slashed .280/.386/.455 with 10 home runs and 33 RBIs.The left-handed hitter was placed on the IL with a left hamstring strain on June 25 and was also diagnosed with a concussion on July 28 after being hit in the helmet by a pitch during his rehab assignment.Horwitz is good to go now though, and he'll help lengthen the Pirates' lineup as they remain on the outside looking in for a Wild Card spot in the National League.Make sure to visit Pirates OnSI for the latest news, updates, interviews and insight on the Pittsburgh Pirates!Add us as a preferred source on GoogleFollow