PITTSBURGH — Konnor Griffin has had his struggles from the plate as a rookie, but he's showing growth and improvements that the Pittsburgh Pirates desperately need. Griffin has been excellent through two games against the Milwaukee Brewers at American Family Field and is putting on quite the show for the Pirates. He had a great first game, where he hit his first home run in the major leagues, a solo shot into the Pirates bullpen on his 20th birthday, making both franchise and MLB history in doing so. Griffin also had a single in the top of the fifth inning and stole a base, then had an RBI-single in the top of the ninth inning, scoring two runners in the 6-0 win and finishing with his first three-hit game as a major leaguer. His second game was good as well, leading off the top of the third inning with a single and then hitting an RBI-single in the top of the fourth inning, putting the Pirates up 2-0 in the eventual 6-3 win in extra innings.…