Who are the biggest winners among 2015 NBA Draft hopefuls?

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When it comes to identifying winners in the 2015 NBA Draft, buy on Stanley Johnson, Karl-Anthony Towns and Rondae Hollis-Jefferson.

Beware of Rashad Vaughn and Devin Booker.

At least that's what our simplistic approach to picking out the difference-makers in the 2015 draft tells us. We've compiled college and high school win-loss records for over 40 NBA hopefuls who played at both levels in the United States (apologies to Emmanuel Mudiay, who played professionally in China last season).

Johnson, the 2013-14 MaxPreps National Player of the Year, tops the list. The Mater Dei (Santa Ana, Calif.) and Arizona product has won nearly 95 percent of the time he has taken the floor over the past five years, capturing four California state titles and Pac-12 Conference regular season and tournament titles in the process.

Towns lost just nine times in three seasons at St. Joseph (Metuchen, N.J.) and bolstered his win percentage as a freshman at Kentucky by helping the Wildcats go 38-1.

A teammate of Johnson's last season at Arizona, Hollis-Jefferson's track record of success is sure to grab the attention of NBA teams in the run up to June 25. The ultra-athletic win man helped Chester (Pa.) run the table en route to a state title in 2011-12 and was a key contributor for a pair of 30-win teams in Tucson.

THE TOP 10

1. Stanley Johnson (.938 combined college/high school winning percentage)
2010-11 – 32-3, Mater Dei (Santa Ana, Calif.)
2011-12 – 34-2, Mater Dei
2012-13 – 34-2, Mater Dei
2013-14 – 35-0, Mater Dei
2014-15 – 34-4, Arizona
TOTAL – 169-11

2. Karl-Anthony Towns (.925)
2011-12 – 29-2, St. Joseph (Metuchen, N.J.)
2012-13 – 27-5, St. Joseph
2013-14 – 30-2, St. Joseph
2014-15 – 38-1, Kentucky
TOTAL – 124-10

3. Rondae Hollis-Jefferson (.880)
2009-10 – 16-10, Chester (Pa.)
2010-11 – 31-1, Chester
2011-12 – 34-0, Chester
2012-13 – 28-4, Chester
2013-14 – 33-5, Arizona
2014-15 – 34-4, Arizona
TOTAL – 176-24

4. Dakari Johnson (.876)
2010-11 – 26-1, St. Patrick School (Elizabeth, N.J.)
2011-12 – 22-5, Montverde Academy (Fla.)
2012-13 – 27-2, Montverde Academy
2013-14 – 29-11, Kentucky
2014-15 – 38-1, Kentucky
TOTAL – 142-20

5. Tyus Jones (.854)
2010-11 – 19-10, Apple Valley (Minn.)
2011-12 – 23-6, Apple Valley
2012-13 – 31-1, Apple Valley
2013-14 – 27-2, Apple Valley
2014-15 – 35-4, Duke
TOTAL – 135-23 (.854)

6. Brandon Ashley (.838)
2008-09 – 20-8, Bishop O'Dowd (Oakland, Calif.)
2009-10 – 29-5, Bishop O'Dowd
2010-11 – 25-7, Bishop O'Dowd
2011-12 – 29-1, Findlay Prep (Henderson, Nev.)
2012-13 – 27-8, Arizona
2013-14 – 33-5, Arizona
2014-15 – 34-4, Arizona
TOTAL – 197-38

7. Cliff Alexander (.826)
2010-11 – 25-3, Curie (Chicago)
2011-12 – 25-3, Curie
2012-13 – 18-8, Curie
2013-14 – 24-2, Curie
2014-15 – 27-9, Kansas
TOTAL – 119-25

8. Justin Anderson (.822)
2008-09 – 21-3, Montrose Christian (Rockville, Md.)
2009-10 – 16-6, Montrose Christian
2010-11 – 25-1, Montrose Christian
2011-12 – 22-3, Montrose Christian
2012-13 – 23-12, Virginia
2013-14 – 30-7, Virginia
2014-15 – 30-4, Virginia
TOTAL – 167-36

T9. Frank Kaminsky (.809)
2009-10 – 22-4, Benet Academy (Lisle, Ill.)
2010-11 – 29-1, Benet Academy
2011-12 – 26-10, Wisconsin
2012-13 – 23-12, Wisconsin
2013-14 – 30-8, Wisconsin
2014-15 – 36-4, Wisconsin
TOTAL – 166-39 (.809)

T9. Chris McCullough (.809)
2010-11 – 25-3, Salisbury School (Salisbury, Conn.)
2011-12 – 22-4, Salisbury School
2012-13 – 32-6, Brewster Academy (Wolfeboro, N.H.)
2013-14 – 26-3, IMG Academy (Bradenton, Fla.)
2014-15 – 18-13, Syracuse
TOTAL – 123-29 (.809)

OTHER PROJECTED DRAFT PICKS

11. Trey Lyles (.808)

12. D'Angelo Russell (.805)

13. Montrezl Harrell (.801)

14. Kelly Oubre (.798)

15. Jahlil Okafor (.793)

16. Travis Trice (.786)

17. Willie Cauley-Stein (.785)

18. Bobby Portis (.776)

19. Joseph Young (.774)

20. Delon Wright (.771)

21. Jordan Mickey (.757)

22. Terry Rozier (.756)

23. Christian Wood (.754)

24. Rakeem Christmas (.753)

25. Vince Hunter (.742)

26. Jerian Grant (.739)

27. Cameron Payne (.736)

28. Kevon Looney (.735)

29. Norman Powell (.733)

T30. Sam Dekker (.720)

T30. Justise Winslow (.720)

32. Jarell Martin (.708)

33. R.J. Hunter (.685)

34. Treveon Graham (.674)

35. Rashad Vaughn (.671)

36. J.P. Tokoto (.670)

37. Terran Petteway (.626)

38. Devin Booker (.614)

39. Aaron White (.608)

40. Robert Upshaw (.604)

41. Myles Turner (.603)

42. Richaun Holmes (.582)

43. Olivier Hanlan (.515)