ST. LOUIS — Brandon Lowe homered, Marcell Ozuna drove in two runs and the Pittsburgh Pirates beat the St. Louis Cardinals 6-2 on Thursday.Rookie Konnor Griffin extended his hitting streak to eight games with a double. He also scored a run and stole a base. Griffin went 6 for 13 in the series and improved to 13 for 33 during his streak.Braxton Ashcraft (3-2) struck out nine in seven innings. He gave up one run on four hits and two walks.The Pirates won their fourth consecutive road series against National League Central opponents.Ozuna, a former Cardinal, singled with one out to score Spencer Horwitz and Griffin, extending the lead to 4-1 in the sixth.Henry Davis hit a leadoff homer in the seventh and Bryan Reynolds drove in a run with a ground out, making it 6-1.Lowe, who also singled, hit a 3-2 fastball that bounced off the top of the wall just inside the left-field foul pole in the first inning. It was originally declared an inside-the-park home run before the stat was changed by the scorer.The Pirates went ahead 2-1 in the fourth inning. Griffin scored on a fielder’s choice by Jake Mangum.Popular ReadsA two-out home run by Iván Herrera in the third inning tied the score at 1-1. Herrera also scored in the eighth on …