The third baseman was booted in the top of the seventh by home plate umpire Andy Fletcher.
Nationals place the right-hander on the disabled list after he left Friday night's game in the second inning.
Manager Matt Williams says the right fielder was "pretty sore" and couldn't loosen up a day after being hit by a 93-mph pitch.
The right-hander left in the second inning with an apparent injury in the series opener on the road.
Having weathered injuries and found a true ace and slugger, Washington is well-positioned for long haul.
Ladies night for the Nationals is June 18. Don't forget your high heels?
Discuss today's Nationals-Reds game here.
Lineups for this afternoon's game in Cincinnati, in which Gio Gonzalez will pitch against Reds' rookie right-hander Raisel Iglesias.
The Nationals right fielder made noise again when he ambled to first in the seventh, then caught up to a 102-mph fastball in the ninth.
The Nationals starter left Friday's game in the second inning with an apparent injury.
He gets a hit and looks good at second base, the position he'll likely man once he's back with Washington.
Taylor has struggled in his second big-league stint of the season, but will be getting more at bats because of Jayson Werth's injury, and looking to improve his consistency.
Matt Williams and Mike Rizzo on the loss of Werth, and what they will do to fill in for him.