Top 100 prospects (Nos. 1-50)

Welcome to ESPN Insider's 2015 ranking of the top 100 prospects in baseball.

This is my eighth such ranking for Insider, with a lot of the same names near the top of last year's list but in a different order based on what we learned from those players' 2014 seasons. Just 10 players from last year's top 50 lost their eligibility for this year's list due to exceeding the limits for rookie of the year eligibility. The list is heavy on position players up the middle, including shortstops near the top of the list and many potential everyday catchers further down, as with the previous year's ranking. A number of the top arms from last year's list were hit by the injury bug, including a few Tommy John surgeries and a number of other arm problems that kept them off the mound, some for almost the entire season.

The Guidelines

• The rankings are limited to players who still have rookie eligibility; that means they have yet to exceed 130 at-bats or 50 innings pitched in the majors and have not yet spent 45 days on the active roster of a major league club, excluding call-ups during the roster expansion period after Sept. 1. That means Milwaukee Brewers infielder Luis Sardinas, for instance, is ineligible, based on his days on the 25-man roster.

• Only players who have signed professional contracts are eligible.

• I do not consider players with professional experience in Japan or Korea "prospects" for the purpose of this exercise, which means no Jung-Ho Kang this year (among others). I also exclude Cuban players who are considered professional free agents by Major League Baseball by virtue of their experience in Cuba's Serie Nacional de Béisbol. This list excludes Rusney Castillo and Yasmany Tomas, but will consider Cuban players whom MLB treats as amateurs, like Roberto Baldoquin (who just missed this list) and Yoan Lopez.

• When ranking players, I consider scouting reports on players -- usually my own, supplemented with conversations with other scouts and front-office executives as needed -- as well as performance, adjusted for age and context. I've made one adjustment in my ranking philosophy in recent years, favoring higher-upside prospects over lower-ceiling prospects who are closer to the majors. This better reflects how these players are valued now by front offices and scouting departments, and gives me a chance to deliver more information on prospects whose names or scouting reports might be new to you.

• I use the 20-80 grading scale in these comments to avoid saying "average" and "above average" thousands of times across the 100 player comments. On that scale, a grade of 50 equals major league average, 55 is above average, 60 is plus, 45 is fringy or below average and so on. Giancarlo Stanton has 80 raw power. David Ortiz has 20 speed. Carlos Gomez is an 80 defender. An average fastball for a right-hander is 90-92 mph, with 1-2 mph off for a lefty.

• I've included last year's rank for players who appeared in the top 100 in 2014. An "ineligible" player was still an amateur at this time last January, whereas an "unranked" player was eligible but didn't make the cut. I've also tagged players who were on last year's sleepers list or list of 10 players who just missed the cut.

Top 100 indexInsider | Nos. 1-50Insider | Nos. 51-100Insider | Top prospects by teamInsider