He came on to pinch-hit with the bases loaded in the ninth inning and delivered the game-winning sacrifice fly in the Nationals' 1-0 win over the Mariners.
"[He] is better today, certainly available to hit, but we're going to give him another day off of running around in left field and see if he can play tomorrow," Jim Riggleman said before the game.
Nix came out of Tuesday's game and has been listed as day-to-day. The foot continues to hamper him.
Since the Nationals play their next six games in American League parks -- they visit the White Sox and Angels --- the designated hitter is an option. Riggleman said that he'd rather use Matt Stairs in that role and see if Nix could go against a right-handed pitcher. Chicago sends out Edwin Jackson in the series opener.
Nix is hitting .280 with 10 homers and 28 RBIs this season. He said also that he's not expecting to DH in the AL cities. Nix is undergoing various treatments, and it's the first time he's dealt with it.
"It's kind of new to me," he said. "[But] hitting's no problem."