PITTSBURGH — The Pittsburgh Pirates continue making roster moves this season, as they try and figure out their bullpen, but also squad as a whole.The Pirates recalled right-handed relief pitcher Isaac Mattson from Triple-A Indianapolis, while optioning right-handed pitcher Antwone Kelly to Triple-A. Mattson returns to the Pirates after going down to Triple-A on May 20, while Kelly heads right back to Indianapolis after making his MLB debut in the 8-3 loss to the Miami Marlins in the series opener at PNC Park on June 12, giving up two earned runs over the final 2.1 innings. Pittsburgh also got catcher Henry Davis off the Paternity List, optioning catcher/first baseman Rafael Flores Jr. to Indianapolis. Flores had two hits in three at-bats in two games for the Pirates, hitting his first MLB home run and starting at catcher in the 8-6 loss to the Los Angeles Dodgers in the series finale at PNC Park on June 11. The Pirates placed right-handed relief pitcher Brandan Bidois on the taxi squad, while catcher Shawn Ross returns to Indianapolis from the taxi squad, as Davis returns.The taxi squad is a place between a MLB team and the minor leagues, keeping a player ready and available in case of an injury, or personal matter that a player would have to miss time from the team, like Davis did. 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