2015 Breakout MLB Stars Who Could Prove to Be 1-Year Wonders

Breakout seasons in baseball come in all shapes and sizes, and they don't care about age or experience. Things click for different players at different times, whether it's a 20-something getting his first chance at regular playing time or a career journeyman who may have finally found a home.

But not every breakout season is created equally. Some lead to a long period of sustained success and stardom, while others prove to be nothing more than blips on the radar, creating those one-year wonders who, while memorable, become irrelevant before too long.

Five players are coming off seasons that need to be more closely scrutinized. Some of them have the potential to be solid players. But stars? I think not.

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