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Rizzo underwent tests on his tight lower back Tuesday, Jesse Rogers of ESPN reports.

Rizzo has been dealing with the issue for about a week after it popped up following a batting-practice session. He was able to hit again Sunday and was reportedly doing better at the time, but he's seemingly back to doing worse again. He's still considered day-to-day, though time is getting tight for him to get into game shape by the start of the season.

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