In Friday's series-opening loss, Machado went 2-for-4 with a go-ahead, two-run homer in the seventh.
"There's a lot of people watching that go, 'Gosh, how does somebody do that in that environment?'" said Showalter. "It's hard. You realize how many people are hoping and expecting failure.
"I think I had more anxiety about it than he did."
Machado's teammates have rallied around him and are keeping the mood loose in a hostile environment.
"What else are you going to do?" Showalter said. "In the whole scheme of life, it's not that big a deal. We try to keep that in mind."
The tension between the two teams stems from a series of incidents involving Machado in Baltimore six weeks ago. Things seemed relatively tame -- at least on the field -- in the series opener, but three Orioles batters did get hit on Friday.
"The last one I wasn't very fond of at all," Showalter said, referring to Adam Jones getting plunked on the left shoulder by A's reliever Ryan Cook during the eighth inning.
Aaron Leibowitz is an associate reporter for MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.