PITTSBURGH — Pittsburgh Pirates shortstop Konnor Griffin is getting better by the day and he showed that in the most recent series vs. the Cincinnati Reds at PNC Park. Griffin had six hits in 12 at-bats against the Reds, hitting .500, while scoring three runs, hitting two doubles, one triple, three RBI and walking twice with just one strikeout in the sweep of a tough rival from the the National League Central Division. It was a big weekend for Griffin, who has steadily gotten better over the past three series, all against divisional rivals and marked his 20th birthday back on April 24. He slashed .405/.463/.676 for an OPS of 1.139 over the past 10 games and is now up to .262/.325/.398 for an OPS of .723 on the season, showing a steady improvement in the first month since making his MLB debut. How Griffin Excelled vs. the Reds Griffin hit single in the bottom of the fifth inning in the series opener vs. the Reds on May 1 and then scored on Henry Davis' second home run of the game to make it 8-0.…