Napoli entered Saturday's game as a pinch-hitter for Mitch Moreland in the 10th inning of the Rangers' 8-7, 13-inning win. He went 0-for-2, striking out and flying out to right to end the 10th and 12th innings.
Napoli said he feels much better and that he doesn't believe he's contagious. He hopes to be back in the lineup Sunday. Napoli was listed in the original lineup on Friday before he was scratched and replaced by Yorvit Torrealba, who went 2-for-5 with a home run.
"I still feel a little nauseated," said Napoli. "But I feel a lot better. I don't feel as sick. I've got some fluids in me."
Napoli wasn't the only one under the weather Friday. Josh Hamilton left Friday's 14-3 win over the Blue Jays with a head cold in the seventh inning.
Like Napoli, Hamilton said that he felt better than he did Friday and started again Saturday, batting third and playing center field. He added his Major League-leading 20th homer on a two-run walk-off blast in the 13th inning Saturday.
"I don't know if you noticed, but he was very slow at the plate tonight," said manager Ron Washington on Friday. "He calmed down tonight, because he wasn't really feeling good. But he battled."
Hamilton left the ballpark before the game ended, going to bed before midnight, but he said he couldn't fall asleep until about 2:45 a.m. Saturday morning.
"You're better when you rest, obviously, than when you're running around and getting hot and sweaty," Hamilton said. "It always helps when you're sick, because you don't feel like trying to do too much. It slows everything down and helps your pitch recognition."
Washington also said Derek Holland felt sick Friday. Holland picked up his fourth win of the year, allowing five hits and one run over 7 1/3 innings, striking out nine and walking one.