PITTSBURGH — The Pittsburgh Pirates are in the midst of their worst run of the season, but could turn things around with some strong showings from their starting pitching in the next series. The Pirates host the Cincinnati Reds at PNC Park, May 1-3, their second series against their National League Central Division rival and will have their No. 2-4 starting pitchers take the mound. Mitch Keller starts in the series opener on May 1, Carmen Mlodzinski throws in the second game on May 2 and then Braxton Aschraft closes the series out on May 3. It's a massive series for the Pirates at an early part of the season, as they and the starting pitching must show up ready to compete and then dominate Why Series is So Imperative for Pirates Cincinnati comes into this series 20-11 and on top of the division, while the Pirates are on a five-game losing streak and just suffered a four-game sweep to the St. Louis Cardinals at home, falling to 16-16 and bottom of the division.…