 Complete the following phrase:  Wilson was returned to the Nationals alternate training site on April 9, as infielder Jordy Mercer, catchers Alex Avila and Yan Gomes, and reliever Brad Hand were activated from the injured list. The Nationals also optioned infielder Carter Kieboom to the alternate training site in Fredericksburg, Virginia, and reassigned catcher Tres Barrera and reliever Ryne Harper to the taxi squad of available players for a series on the road against the 