It's rare to see a teenager make his Major League Baseball debut. It's even rarer to see a guy that young have legit success in the big leagues pretty much right away. But that is the case with Pittsburgh Pirates shortstop Konnor Griffin. Griffin made his big league debut on April 3 and has played in 30 gams since. He turned 20 years old on April 24 and his game has only picked up from there. Before his birthday, Griffin was slashing .182/.247/.242 with zero homers, eight RBIs, four stolen bases, two doubles and one triple in 19 games played . Those numbers don't sound great, but again, this was a 19-year-old we're talking about playing at the highest level of baseball. Clearly, he found his footing afterward and since April 24 , has slashed .410/.477/.692 with a 1.170 OPS, two homers, eight RBIs, five walks, three stolen bases, three doubles, one triple, and six runs scored in 11 games.…