articleMichael Busch greeted Paul Skenes with the fourth leadoff home run of his career and the Chicago Cubs moved to the brink of their first playoff berth in five years with a 4-1 victory over the Pittsburgh Pirates on Tuesday night. The Cubs winnowed their magic number to one by chasing Skenes (10-10) during a rare rocky outing for the NL Cy Young Award favorite. Yet the 23-year-old's final start at PNC Park this season was a rare misstep at a place where he has dominated. Key statSkenes has 209 strikeouts, one short of Mitch Keller's single-season record for most by a right-handed pitcher in the franchise's 137-year history. Up nextThe NL Central rivals meet for the final time this season Wednesday when Chicago's Matthew Boyd (13-8, 3.05 ERA) starts against Johan Oviedo (2-0, 2.81).