Meidroth (hamstring) will start at second base and bat eighth Tuesday in Game 1 of the American League Wild Card series in Houston.
Richards was credited with the save Sunday against Colorado, allowing one run on one hit and no walks in 3.1 innings. He struck out three.
Kay (10-9) earned the win Sunday against the Rockies, striking out four while allowing one run on five hits and two walks in five innings.
Williamson (5-5) took the loss Sunday against Toronto, striking out three while allowing four runs on four hits and three walks in three innings.
Vargas is not in the starting lineup for Sunday's game against the Rockies.
Murakami went 3-for-4 with two homers, three RBI and a strikeout during Friday's 6-1 win over the Rockies.
Antonacci went 3-for-4 with a run scored during Friday's 6-1 win over the Rockies.
Burke (11-7) earned the win after allowing one run on four hits and one walk over 5.1 innings against the Rockies on Friday. He struck out seven.
De La Cruz went 1-for-4 with a two-run double and a steal during the Reds' 6-5 loss to the Blue Jays on Friday.
Lodolo did not factor into the decision Friday against the Blue Jays, allowing two runs on seven hits and two walks while striking out three across five innings.
Luis Castillo will face a Reds team where he spent the first 5.5 years of his career. While the Reds don’t qualify as a tough matchup, Castillo’s strikeout metrics have begun to substantially decline and the veteran hurler has been shaky from the mound. Six Ks is a tall order considering the current form Castillo is in.
