For these breakthroughs, I considered:
• Players who were no longer rookies to start 2014.
• Players who either established a substantially higher level of performance, or who established themselves as everyday players/mid-rotation starters when they were previously part-time or extra players.
While many other players had apparent breakouts this year (e.g., Josh Harrison), these 10 players all have had breakouts that I believe are sustainable into future seasons. I picked five starters and five position players.