When the Astros promoted top prospect George Springer earlier this week, it ended a mini-drama that cut to the heart of Major League Baseball's rules concerning Super Two status and free-agency eligibility. MLB, of course, allows players to become free agents after six full years of service. By waiting two weeks after the start of the season to promote Springer, the Astros ensured that they could control his rights through 2020. But by promoting him before June, they also gave him the chance to become a Super Two player. That meant he could be eligible for arbitration following the 2016...

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