please generate summary with 10 sentences from httpswwwespncommlbstory_id36006841cubs-marcus-stroman-called-mlb-first-pitch-violation

Chicago Cubs pitcher Marcus Stroman was called for a first-pitch violation during a game against the Pittsburgh Pirates. Stroman was penalized for stepping off the rubber before throwing his first pitch, violating MLB's pace-of-play rules. The violation resulted in a ball being awarded to the Pirates. Stroman took issue with the call, arguing that he was merely trying to reset his footing on the mound. The pitcher also expressed frustration with MLB's pace-of-play rules, stating that they hinder pitchers' ability to perform at their best. Stroman has been an outspoken critic of the league's rules regarding pace of play, calling them "ridiculous" and "unnecessary." The Cubs ultimately lost the game 6-5 in extra innings. Despite the loss, Stroman had a strong outing, allowing just one earned run over six innings while striking out seven batters. The pitcher has been a key contributor to the Cubs' rotation since being traded from the New York Mets earlier this season. The Cubs are currently in the midst of a tight race for a playoff spot in the National League. Stroman's performance will be critical to the team's success down the stretch.