CHICAGO -- The top prospect in baseball is one step closer to reaching Pittsburgh.

Konnor Griffin -- the No. 1 prospect in the game, according to MLB Pipeline -- is being promoted to Double-A Altoona, sources tell MLB.com. It’s his second promotion up the Pirates’ farm system this year in what has been a meteoric rise for the shortstop/center fielder.

Griffin, 19, has slashed .332/.414/.524 with 16 home runs, 72 RBIs and 59 stolen bases this season in 101 games for Single-A Bradenton and High-A Greensboro. Those results have only improved with Greensboro, with a .942 OPS and 33 stolen bases on 40 attempts over 51 games in High-A.

“It’s been a pretty impressive run,” general manager Ben Cherington said on his radio show on 93.7 The Fan last Sunday. “He fills up a box score. You look a

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