The Nationals optioned Bird to Triple-A Rochester following Tuesday's game against the Rockies.
The Nationals are expected to recall Perales from Triple-A Rochester on Wednesday, Kyle Williams of TheBanner.com reports.
Waldron will serve as the opening pitcher in Wednesday's game against Colorado, Mark Zuckerman of NatsJournal.com reports.
The Pirates optioned Curtis to Triple-A Indianapolis on Tuesday, Colin Beazley of the Pittsburgh Post-Gazette reports.
The Pirates recalled Murdock from Triple-A Indianapolis on Tuesday, Colin Beazley of the Pittsburgh Post-Gazette reports.
Ruiz is absent from the lineup for Tuesday's contest versus the Rockies.
Chaparro is absent from the lineup for Tuesday's contest against the Rockies.
The Nationals designated Williams for assignment Tuesday.
Gray (elbow) is scheduled to make the third appearance of his rehab assignment Tuesday with High-A Wilmington, Mark Zuckerman of NatsJournal.com reports.
Vivas went 3-for-5 with two RBI, a run scored and a strikeout during a 13-3 win over Colorado on Monday.
Pittsburgh was just swept by the last place Orioles while Washington is playing their best baseball of the season. In the month of September, the Nationals are 6th in the majors with scoring 55 runs and are 7-3 SU in their last 10 while the Pirates have lost six straight. Washington is hitting .284 over their last seven days and can get to Mitch Keller who’s allowed a combined 16 runs over his last five starts.
