Pratto, 18, is off to somewhat of a slow start in the Arizona Rookie League, hitting .218 with two home runs and 18 RBIs in 22 games.
Center fielder Khalil Lee, a third-round pick in the 2016 Draft, has shown exceptional power and is No. 2 on the list after being No. 14 preseason. Lee, 19, has 13 home runs and a .433 slugging percentage at Class A Lexington.
Hunter Dozier, an outfielder/third baseman, dropped from No. 2 to No. 3. He has missed almost the entire season because of injuries.
Outfielder Seuly Matias, an undrafted free agent signed out of the Dominican Republic who is 18 years old but already a solid 6-foot-3 and 200 pounds, jumped to No.