Jaso tried to advance to second on a ball in the dirt in the first inning, but he was thrown out sliding headfirst.
"It was one of those plays where I was kind of trying to read the ball in the dirt and take an extra base," Jaso said. "The throw took [Orioles shortstop Ryan] Flaherty a little bit off the base. So he kind of had to drop his knee down. It was one of those things where everything came together and created a bad situation for me. ... I jammed my hand into his leg."
David DeJesus pinch-hit for Jaso, who was the Rays' DH and leadoff batter.
"Got an X-ray and an MRI done," Jaso said. "There's no breaks. And it's just basically swelling in there. It's really sore right now. And just kind of take it like, show up tomorrow. See where it's at and then keep going from there."
Jaso's status is day to day, but it's likely he'll miss a couple of days, according to Rays manager Kevin Cash. The Orioles are starting left-hander Wei-Yin Chen on Tuesday night, so Jaso would not have been in the lineup anyway.
Bill Chastain is a reporter for MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.