Highly touted Stanford University slugger Rintaro Sasaki made an impressive debut in the MLB Draft League, one of the top amateur summer leagues in the United States, with a home run Tuesday. The 19-year-old left-handed hitter, who skipped Japanese pro baseball’s draft to play U.S. college baseball, went 2-for-5 with three RBIs in the Trenton Thunder’s 11-1 rout of the Frederick Keys in the state of Maryland. Sasaki, batting cleanup for the Trenton, New Jersey-based team, launched a two-run blast to right to put Trenton ahead 3-1 in the third inning. He also had a run-scoring single in the six…