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Paul Lo Duca fractured the the fourth metacarpal bone in his right hand and is set to miss 4-6 weeks.
No word yet on whether the Nats will call up Jesus Flores to start or go with Wil Nieves and Johnny Estrada, both of whom are already on the roster. We'll guess the latter. Elijah Dukes could be activated to replace Lo Duca on the roster.

Lo Duca Out 4 to 6 Weeks - Nationals Journal