BALTIMORE - The Nationals made a flurry of roster moves ahead of the final series of the first half, the first of two interleague series against the Orioles at Camden Yards.
Center fielder Denard Span, who has been troubled by back problems and previously said he expected to miss the weekend series, was placed on the 15-day disabled list, while right-hander Jordan Zimmermann was placed on the paternity list.
To take their places on the 25-man roster, the Nationals recalled infielder Wilmer Difo from Double-A Harrisburg and activated right-hander Aaron Barrett from the 15-day DL. Barrett had missed 24 games with a right biceps strain.
Difo, rated by Baseball America as the No. 7 prospect in the Nationals organization, is hitting .296 with 19 doubles, a triple, three homers, 32 RBIs and 14 stolen bases in 63 games between Single-A Potomac and Harrisburg. This will be Difo's third stint with the Nats this season.
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