Pittsburgh Pirates' Adam Frazier, bottom, is doused by Gregory Polanco, left, and Josh Bell, rear, after driving in the game winning run with a walk-off single off St. Louis Cardinals relief pitcher Brett Cecil in the ninth inning of a of a baseball game in Pittsburgh, Sunday, July 16, 2017. The Pirates won 4-3.(AP Photo/Gene J. Puskar)
PITTSBURGH -- The Pirates closed their series against the St. Louis Cardinals the same way they began it: with a walkoff win.
Adam Frazier's game-ending single capped a two-run rally in the ninth inning that lifted Pittsburgh to a 4-3 victory Sunday.
Max Moroff hit his first big league home run for the Pirates, a line drive off the right-field foul pole in the fifth. Moroff had 18 homer runs this season with Triple-A Indianapolis but was 4 for 48 in the majors.
"I hit the ball on the barrel for the first time in a while," he said.
Williams had started his MLB career 0 for 21 before his single to right in the third.
Cardinals rookie Magneuris Sierra, brought back from Triple-A on Saturday, had four hits, stole a base and scored a run. He has reached safely in nine straight games to start his big league career, the first Cardinals player to accomplish the feat.
Three of the hits never left the infield.
"I'm definitely aware that my speed can cause the other team some damage and help my team," he said through a translator. "As soon as I make contact, I really take advantage of the opportunity to get on base."
Cardinals: RHP Adam Wainwright(10-5, 5.20 ERA) is to start Monday at the New York Mets. He is 8-2 in his last 11 starts, winning his last three.
Pirates: RHP Chad Kuhl (3-6, 4.96 ERA) is slated to open at series at home against Milwaukee. He is 2-0 in five starts since a June 14 loss to Colorado.