20 famous athletes who retired early like Andrew Luck

Andrew Luck's decision to retire caught the NFL world by surprise, but he's hardly the first athlete to call it quits early.

In fact, Rob Gronkowski decided to retire at the same age as Luck, just a few months beforehand. More NFL players may follow their lead.

Throughout sports history, there have been surprising retirement announcements from players who figured to have plenty of years left in their career. Most of the time, injuries play a big part in their decision to hang up their jerseys.

Here are a few examples of professional athletes who ended their careers earlier than expected.

Source: Business Insider

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Andrew Luck • Andrew Luck • National Football League • Rob Gronkowski • National Football League •