TORONTO -- Edwin Encarnacion hit his fifth career grand slam, and Brandon Morrow pitched seven-plus innings as the Toronto Blue Jays defeated the Baltimore Orioles 12-6 Thursday.
The Blue Jays (20-27) spoiled the major league debut of right-hander Kevin Gausman, who was promoted from Double-A Bowie by the Orioles (25-22) for the opener of a four-game series.
The 22-year-old allowed seven hits, including a two-run homer by J.P. Arencibia, and four runs in five innings before a crowd of 21,466 at Rogers Centre.
Morrow (2-3) who pitched two batters into the eighth. He gave up 10 hits, including home runs by Chris Davis, Nick Markakis and Adam Jones, six runs and one walk while striking out five.
Left-hander Troy Patton took over for Gausman (0-1) in the sixth.
Patton's first batter, Colby Rasmus, had his foul down the left field line caught spectacularly by Nate McLouth, who tumbled into seats. After McLouth returned to the field, what appeared to be beverage container was thrown in his direction from the stands but did not hit him. The game was halted briefly as manager Buck Showalter went out to check on his player.
The Blue Jays loaded the bases with two outs on two walks by Patton and one by right-hander Pedro Strop. Encarnacion hit a grand slam off the pole in left, his 13th homer of the season, to give the Blue Jays an 8-3 lead.
The Orioles scored in the seventh on a double by J.J. Hardy and a sacrifice fly by Alexi Casilla. Markakis hit his fifth homer of the season on the first pitch of the eighth from Morrow, and Jones followed with his seventh of the year before left-hander Brett Cecil took over.
Arencibia, Adam Lind and Brett Lawrie each had two hits for Toronto. Arencibia finished with four RBIs.
The Orioles took a 2-0 lead in the third on singles by Chris Dickerson and Nate McLouth and a double by Manny Machado, who had three hits on the night.
Davis hit the first pitch of the fourth off the right field foul pole for his league-leading 15th home run of the season.
The Blue Jays cut the lead to 3-2 with two runs in the bottom of the fourth. Lind and J.P. Arencibia opened the inning with doubles to score one. Lawrie beat out a bunt down the first base line, leaving runners at the corners. Colby Rasmus walked to load the bases before Emilio Bonifacio hit a sacrifice fly to the warning track in center for the second run.
The Blue Jays took a 4-3 lead in the fifth on Arencibia's 11th homer of the season. After Lind's two-out single, Arencibia hit the first pitch over the left field wall.
NOTES: LHP Sean Nolin will make his major league debut when he starts Friday for the Blue Jays after being called up from Double-A New Hampshire. Nolin will face Orioles RHP Chris Tillman (3-2, 3.52). ... With Gausman's promotion, the Orioles optioned RHP Jake Arrieta to Triple-A Norfolk. ... Baltimore also designated for assignment RHP Alex Burnett, who was pitching for Norfolk. ... RHP Chad Jenkins will start Sunday's game for Toronto instead of RHP Ramon Ortiz. ... Gausman is the 21st pitcher used by the Orioles this season. He is the third Oriole to make his major league debut, joining LHP T.J. McFarland and RHP Zach Clark. ...Toronto RHP Josh Johnson (triceps) will make his second minor league rehab start Saturday for Triple-A Buffalo.