ベネズエラン・サマーリーグ
Phillies' scouts Sal Agostinelli and Jesus Mendez signed him as an amateur free agent on July 2, 2006, at age 16. Hernández began his professional career in 2007, spending his first two seasons with the Venezuelan Summer League (VSL) Phillies. That year, he hit .276./328/.436 with 8 triples (leading the league) and 7 sacrifice hits (4th) in 54 games; he committed 15 errors. In the Venezuelan Summer League again in 2008, Hernández hit .315 (8th in the league)/.412 (6th)/.426 with 6 triples (tied for the league lead) and 19 stolen bases (4th) in 60 games, reducing his error total to 8. Between his two seasons in the VSL, he made 59 starts as a second baseman and 35 starts as a shortstop.