TORONTO -- With new ace starter David Price in their dugout for the first time, the Toronto Blue Jays displayed their growing confidence on Friday night.

Twice they trailed by three runs and twice the came back to tie.

Then in the 11th inning, third baseman Josh Donaldson hit a walkoff single to defeat the Kansas City Royals 7-6.

"This is a very exciting team," said Price, who was obtained in a trade Thursday with the Detroit Tigers. "That's what good teams do. It was very impressive."

The left-hander overcame a flat tire to finally reach Rogers Centre just before game time and was in the dugout to cheer on his new team.

"With the trades that happened this week, I think what it gave us was more confidence in ourselves," said Donaldson, who had four RBIs. "You know that (general manager) Alex (Anthopoulos) believes in this team, the city believes in this team and we believe in this team. You add extra pieces like we did (and) it's starting to really come together."

The Blue Jays (53-51) have won three in a row and the Royals (61-41) lost their third in a row.

"Tough game to lose," Royals center fielder Lorenzo Cain said.

The loss spoiled a decent Royals debut of right-hander Johnny Cueto, who was obtained Sunday in a trade with the Cincinnati Reds on Sunday.

He allowed seven hits, two walks and three runs in six innings. He struck out seven and did not factor in the decision.

"He did a great job his first start here," Cain said. "Unfortunately, we didn't hold the lead there at the end. He was locked in, he did a great job against a really good team."

Cueto said, "I thought I threw the ball pretty good. I felt good on the mound and I thought I made one bad pitch (on a two-run double in the third by Donaldson). The rest of the game went well.

"You've got to execute every pitch. With a lineup like this, you make a mistake and you're going to get hurt. You've just got to make sure you execute pitch to pitch."

Blue Jays shortstop Troy Tulowitzki singled with one out in the 11th against left-hander Franklin Morales (3-1) to set up Donaldson.

Tulowitzki took second when Morales was called for a balk and Donaldson singled on a 3-2 pitch to give the Blue Jays and right-handed reliever Liam Hendriks (3-0) the win.

"He's definitely one of the guys you want up there," Blue Jays manager John Gibbons said. "He's a power guy, but he's also a complete hitter. What separates him is he still gets base hits at the right time. He’ll turn it loose at times and goes for the down at times, but he plays the situation great."

Blue Jays right-hander Drew Hutchison allowed seven hits, one walk and four runs (three earned). He had one strikeout in his five-plus innings.

Hutchison left after Cain led off the sixth with an infield single to second.

Left-hander Aaron Loup came in and gave up an infield single to first baseman Eric Hosmer to Donaldson, whose errant throw allowed Cain to score.

Hosmer, whose third-inning single gave him a 13-game hitting streak, went to third on the error and came home on a sacrifice fly by designated hitter Kendrys Morales against right-hander Bo Schultz and the Royals led 5-3.

Shortstop Alcides Escobar drove in a run with a single against Schultz in the seventh to stretch the Kansas City lead to 6-3.

Second baseman Ryan Goins led off the seventh with a single against right-handed reliever Ryan Madson.

Tulowitzki singled to center and Goins scored when the ball got past Cain for an error. Tulowitzki reached second. Donaldson doubled to cut the lead to one. Right fielder Jose Bautista singled to left to put runners at the corners.

Right-hander Kelvin Herrera replaced Madson and walked DH Edwin Encarnacion to load the bases. First baseman Justin Smoak grounded into 6-4-3 double play as Donaldson scored to tie the score 6-6.

The Royals took a 3-0 lead in the first inning. Cain doubled with two out and stole third. Hosmer walked and Morales doubled home one run. Left fielder Ben Zobrist singled in two runs.

Left fielder Ezequiel Carrera bunted for a single to lead off the third. The safe call at first base withstood a challenge after a review of nearly three minutes.

Center fielder Kevin Pillar followed with a single. There were runners at the corners after Goins forced Pillar, who made a good slide, at second. Donaldson doubled in two runs to cut the Royals' lead to 3-2.

Pillar singled in Encarnacion with the tying run in the fourth. Encarnacion had led off with a single off the wall in right and had taken second base on Carrera's two-out single.

NOTES: Toronto 2B Devon Travis (left shoulder inflammation) went on the 15-day disabled list Friday and LHP David Price was added to the 25-man roster. Price, acquired from the Detroit Tigers on Thursday, will make his Blue Jays debut on Monday against the Minnesota Twins. RHP R.A. Dickey will start Sunday. ... The Blue Jays obtained OF Ben Revere from the Philadelphia Phillies to play left field and RHP Mark Lowe from the Seattle Mariners for the bullpen. Neither was available Friday. ... Royals manager Ned Yost said RHP Chris Young will move to the bullpen and RHP Jeremy Guthrie will remain in the rotation after the addition of RHP Johnny Cueto. ... DH/1B Edwin Encarnacion (jammed finger) returned to the Toronto lineup after missing two games. ... The Royals will start RHP Yordano Ventura (5-7, 4.86 ERA) on Saturday against Blue Jays LHP Mark Buehrle (11-5, 3.29).