Drew Pomeranz will get the ball as the A's try to avoid a sweep at the hands of the Blue Jays on Sunday afternoon at Rogers Centre. Pomeranz, a 25-year-old lefty, carries a 4-1 record into his first career appearance against the Blue Jays, who are on a five-game winning streak and sit atop the American League East.
Since moving from the bullpen to the rotation, Pomeranz has strung together three consecutive starts of five innings pitched and no runs allowed, becoming the first A's pitcher to do so since Ted Lilly in September 2003.
"Five and dive, three times in a row," said Pomeranz, whose 0.94 ERA in 12 total appearances this year ranks second in the Majors among pitchers with 25 or more innings.
On Tuesday, the lefty held the Rays to just three hits and two walks with three strikeouts, finishing at 89 pitches as he continues to build up his pitch count as a starter. He will likely be given the green light for the 100-pitch mark Sunday.
"He's looking real comfortable and like he's pitching with a lot of confidence," said A's reliever Sean Doolittle.
J.A. Happ will start for Toronto. Happ cruised through four innings during his last start against Boston, but his outing fell apart in the fifth. He allowed three doubles and then surrendered a two-run shot in the sixth. He was charged with four runs in five-plus innings.
"I think for whatever reason, just not quite as sharp," Happ said. "I tried to mix it up after that first round through. They battled, they're a good team, that's kind of what they do. Wait for you to make a mistake."
The lefty is 3-1 through seven starts after beginning the season on the disabled list, followed by a stint in the bullpen.
A's: Punto, Jaso day to day; Lowrie expected in lineup Sunday
Infielder Nick Punto (left calf strain) and catcher John Jaso (back tightness) are not expected to play in Sunday's finale. Both were held out of Saturday's game, as was Jed Lowrie.
The shortstop, battling lingering neck soreness, is likely to return to the starting lineup to face the left-handed Happ. Lowrie has missed three of the A's last five games with the injury.
Blue Jays: Janssen on a career-best streak
Blue Jays closer Casey Janssen is out to a perfect start after missing the first five weeks of the season with an oblique injury.
The 32-year-old has converted six straight save opportunities -- the longest streak of his career -- and owns a 0.00 ERA in seven innings pitched, during which he's allowed five hits and one walk.
Janssen delivered his sixth straight save Friday night as the Blue Jays beat the A's, 3-2, in the first of a three-game series. He had a day off Saturday, but he will be ready to go again on Sunday.
Janssen has converted 22 consecutive save chances since Aug. 4, 2013.
• Toronto has recorded an extra-base hit in 35 straight games, and the team leads the Majors in XBH in May with 93.
• With their loss Saturday, the A's are now 5-3 on their current road trip and have dropped three straight. They've lost only four games in the last 15.
• With his single in the first inning Saturday, Melky Cabrera has now hit safely in 41 of his 49 games this season.
Jamie Ross is an associate reporter for MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.