Wynns and the Cubs agreed on a minor-league contract Tuesday.
Chaparro is absent from the lineup for Tuesday's contest against the Rockies.
Ruiz is absent from the lineup for Tuesday's contest versus the Rockies.
The Nationals designated Williams for assignment Tuesday.
Kelly went 1-for-3 with a solo home run and a walk in Monday's 7-0 win over Arizona.
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.
Miller was sent outright to Triple-A Iowa on Monday.
Lile went 3-for-5 with a three-run homer, five RBI, a double, a stolen base and two runs scored during Monday's 13-3 win over Colorado.
Cavalli (12-5) earned the win after allowing two runs on five hits and one walk through six innings. He struck out seven.
That was some overdue good news for the Nats on their just-completed road trip to far-away Seattle and Arizona, winning two of three vs. each, and threatening a sweep of the D-backs until running into Corbin Burnes on Sunday. Now the question is if Washington is going to be able to push the envelope a bit further on this homestand, but at the outset it won't be easy vs. a hot Cubs side that enters D.C. having won 12 of 15, and posting wins in the first four starts made by rookie sensation Cade Horton. Worryingly for Washington, Tuesday starter Trevor Williams has not posted good numbers thus far at home (6.48 ERA in five starts at Nats Park). Play Cubs on Run Line
