But Norris and Pompey weren't the only breakout stars. Right-hander Miguel Castro and shortstop Richard Urena weren't ranked a year ago, but they have now entered the top 10. Outfielder Dwight Smith Jr. and left-handers Matt Smoral and Ryan Borucki also significantly raised their profile after being unranked a year ago.
Toronto's 2014 First-Year Player Draft class is already making its impact felt. Five players selected by the Blue Jays -- whose system is ranked No. 10 -- last June have entered the rankings, and the club's top three picks -- right-hander Jeff Hoffman, catcher Max Pentecost and right-hander Sean Reid-Foley -- are in the top 10.
• Blue Jays' 2015 Top 30 Prospects list
Biggest jump: Miguel Castro, RHP (2014: Unranked | 2015: 7)
Biggest fall: Tom Robson, RHP (2014: 14 | 2015: Unranked)
Players are graded on a 20-80 scouting scale for future tools -- 20-30 is well below average, 40 is below average, 50 is average, 60 is above average and 70-80 is well above average.
Hit: Pompey (60)
Power: Rowdy Tellez (55)
Run: D.J. Davis (80)
Arm: Dawel Lugo (60)
Defense: Pompey (60)
Fastball: Aaron Sanchez (70)
Curveball: Sanchez (65)
Slider: Norris (60)
Changeup: Norris (60)
Control: Matt Boyd (55)
How they were built
Rule 5/Free agency: 0
Breakdown by ETA
Breakdown by position
Teddy Cahill is a reporter for MLB.com. Follow him on Twitter at @tedcahill. This story was not subject to the approval of Major League Baseball or its clubs.