BALTIMORE -- The Baltimore Orioles and Tampa Bay Rays both made significant late additions before their showdown at Camden Yards.
The Orioles called up outfielder Heston Kjerstad from Triple-A Norfolk on Thursday, adding another top prospect to the big league club hours before starting a huge four-game series against Tampa Bay. The Rays activated outfielder Manuel Margot from the injured list after he had been sidelined by a right elbow problem.
"This is something I've worked for my whole life, something I've thought about," Kjerstad said. "To finally be here and be in the moment is awesome so far."
The Orioles' lead over Tampa Bay atop the American League East was cut to one game after Thursday's series-opening 4-3 loss. Kjerstad appeared as a pinch-hitter in the eighth and struck out.
Kjerstad was the No. 2 pick in the 2020 amateur draft and is ranked 49th in ESPN insider Kiley McDaniel's latest top 50 prospects. He hit .298 with 10 home runs and 32 RBIs in 76 games at Norfolk.
The Orioles called him up after slugger Ryan Mountcastle left Wednesday night's loss to St. Louis with a shoulder issue. Manager Brandon Hyde said Thursday the team got "great news" on Mountcastle, and he's feeling a lot better.
In addition to selecting Kjerstad's contract, Baltimore recalled right-handed reliever Bryan Baker from Norfolk and optioned outfielder Ryan McKenna and left-hander Nick Vespi to Norfolk.
The Orioles recalled utilityman Terrin Vavra from Norfolk and put him on the 60-day injured list with a strained right shoulder.
Kjerstad joins a Baltimore team led by second-year catcher Adley Rutschman and rookie infielder Gunnar Henderson. Right-hander Grayson Rodriguez and infielder Jordan Westburg are among the highly regarded prospects the Orioles have promoted this year.
"It happens with good teams with good farm systems," Hyde said. "Heston's had a really nice year in Triple-A. Been fun to watch him from afar."
Margot has hit .249 in 85 games this season for the Rays. He returns to a team that's been able to stay within striking distance of the Orioles despite missing several key players.
"I think he's a hundred percent with everything -- maybe the throwing might be a little less than a hundred, but we would expect that," Rays manager Kevin Cash said. "And that might not come back until a couple weeks down the road. We weren't going to wait that long to activate him."
Ace Shane McClanahan had Tommy John surgery last month, and star shortstop Wander Franco has been on administrative leave while authorities in the Dominican Republic investigate him for an alleged relationship with a minor. Right-handed reliever Jason Adam (left oblique strain) and outfielder Jose Siri (right hand fracture) went on the IL earlier this month.
The Rays optioned infielder Vidal Bruján to Triple-A Durham.
The Orioles also made a couple of moves with their leadership. Greg Bader was promoted to executive vice president and chief operating officer and Kerry Watson was hired as executive vice president, public affairs. Lisa Tolson takes on the title of senior vice president and chief people officer.
The team and the state of Maryland face an important offseason, with the Orioles' lease expiring at the end of the year.
The Associated Press contributed to this report.