TORONTO – Jorge Mateo is in tonight’s Orioles lineup at shortstop, with Jackson Holliday moving to second base and Jordan Westburg to third.

Mateo is batting ninth and Holliday rises to eighth.

Colton Cowser is leading off again and playing left field. Westburg remains the No. 3 hitter. Cedric Mullins moves up to sixth and Ryan Mountcastle drops to seventh.

Charlie Morton makes his Orioles debut. He’s started only twice at Rogers Centre and allowed two runs in 10 2/3 innings.

Bo Bichette is 5-for-16 with a double and home run against Morton, who at 41 years and 136 days is the oldest pitcher to start for the Orioles.

The Blue Jays are starting Kevin Gausman, who has a 4.75 ERA in seven career outings against his former team.

Mountcastle is 6-for-19 with a double and four RBIs against Gausman. Adley Rutschman, who homered twice in the opener, is 4-for-21 with a double.

For the Orioles

Colton Cowser LF Adley Rutschman C Jordan Westburg 3B Ryan O’Hearn DH Tyler O’Neill RF Cedric Mullins CF Ryan Mountcastle 1B Jackson Holliday 2B

Jorge Mateo SS

Charlie Morton RHP

For the Blue Jays

Bo Bichette SS Vladimir Guerrero Jr. 1B Anthony Santander DH Andrés Giménez 2B Alejandro Kirk C George Springer RF Will Wagner 3B Nathan Lukes CF

Alan Roden LF

Kevin Gausman RHP

Dean Kremer and Tomoyuki Sugano start the last two games of the opening series. The Blue Jays are starting Max Scherzer and Chris Bassitt.

Tonight’s game airs on Apple TV+.

Gunnar Henderson is leading off and playing shortstop tonight at Triple-A Norfolk.

The gates to Camden Yards for Monday’s first home game will open three hours before first pitch at noon. Parking lots will open at 11 a.m.

Baltimore native and “American Idol” contestant Gabby Samone will perform the anthem.