Sort of cherry picking here, but among qualified hitters in the GCL, Orelvis Martinez is:
1) The only 17 or 18 year old with an ISO over .200, 8 hitters total have accomplished this
2) One of three 17 year olds with a wRC+ over 100, the others are Victor Mesa Jr. (127 wRC+) - not to be confused with his brother Victor Victor Mesa - and Andrick Nava (110 wRC+) of the Phillies. Martinez will likely have his wRC+ close or surpassing Mesa after this game, as his currently sits at 121.
Hiraldo cherry picking, among qualified hitters:
1) 5th lowest K-rate
2) 11th highest wRC+ in the league, the next closest 18 year old has a wRC+ of 108. Only two 19 year olds are above him and they're both within a point of his wRC+