Chaparro went 2-for-2 with a double, three RBI and two runs scored during Saturday's 8-2 win over the Reds.
Alvarez did not factor into the decision Saturday against the Reds, allowing one run on three hits and one walk while striking out two across 5.1 innings.
Lord will start Sunday's matchup against the Reds, per Mark Zuckerman of NatsJournal.com.
Washington demoted Palmquist to Triple-A Rochester on Saturday.
Chandler (5-8) earned the win against the Mets on Saturday, allowing three hits and one walk while striking out five across six scoreless innings.
Mangum went 3-for-5 with two doubles, one RBI, one steal and two runs scored during the Pirates' 9-0 win over the Mets on Saturday.
Simon went 2-for-5 with a two-run double and a steal during the Pirates' 9-0 win over the Mets on Saturday.
Gonzales went 1-for-5 with a double and three RBI during the Pirates' 9-0 win over the Mets on Saturday.
Lowe went 1-of-4 with a walk, a solo homer and an additional run scored during the Pirates' 9-0 win over the Mets on Saturday.
Rodriguez was scratched from the lineup for Saturday's game against the Mets, Danny Demilio of PittsburghBaseballNow.com reports.
