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Nationals manager Matt Williams said Wednesday the third opinion on third baseman Anthony Rendon's injured left knee confirmed the first two opinions -- a sprained MCL.

Williams said Rendon will continue to rehab the injury, but delivered the bad news that Rendon will begin the season on the disabled list. Williams said Rendon has a week-to-week type of injury, and sources told CBSSports.com Baseball Insider Jon Heyman that Rendon could be back in three weeks.

General manager Mike Rizzo did not put a timetable on Rendon's return.

“It's positive news,” Rizzo told Heyman. “All three (doctors) agreed. There's nothing seriously wrong, and it should remedy itself. Some turn the corner quickly and with other guys it takes a few weeks. But he will be fine.”

Yunel Escobar is expected to fill in at third base during Rendon's absence, which means Danny Espinosa will likely replace Escobar at second base. Dan Uggla could also be an option, if he makes the Opening Day roster. Ryan Zimmerman is not expected to move back to third base with Rendon sidelined.

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