The Blue Jays and Red Sox kick off a three-game series in the log-jammed American League East on Tuesday.
As of Sunday, four wins separate the first and last place teams in the AL East, making it one of the tightest divisions in baseball right now.
The Red Sox, the defending World Series champions, are in the midst of their first four-game losing streak since the end of the 2012 season.
"We've got to regroup," said Red Sox manager John Farrell. "We've got to be better in all phases. Toronto comes in here, and this is a team that's playing well. Collectively, we have to be better all the way around."
J.A. Happ will draw the start for the Blue Jays at Fenway. The lefty bounced back from a dismal 2 1/3-inning outing in a loss to the Angels to record his second win Thursday, which came at home against Cleveland. He went six innings and allowed six hits and one earned run vs. the Indians. He walked two batters and struck out four.
After starting the season on the disabled list, followed by a stint in the bullpen, Happ is pitching like he's got something to prove.
"I think you're always [trying to prove yourself] to somebody," Happ said following his second win of the season. "I felt good, definitely nice to go out there and have a fairly strong outing."
Felix Doubront (2-3, 4.54 ERA) will get the ball for Boston. Doubront has been inconsistent, but he does have four quality starts in eight tries. The southpaw did it again in his last appearance, when he held the Twins to one run in six innings. He allowed seven hits, walked one and struck out five.
He's 0-2 at home this season. He was 1-0 in three starts against the Blue Jays last season.
Blue Jays: Hendriks could get call up
The Blue Jays appear to be leaning toward making right-hander Liam Hendriks their No. 5 starter when the need for another pitcher arises on Saturday.
Toronto general manager Alex Anthopoulos made the trip to watch Hendriks pitch vs. Triple-A Lehigh Valley on Saturday afternoon. Hendriks responded by allowing just four hits and one walk while striking out three over seven innings for Buffalo.
The 25-year-old lowered his ERA to 1.48, and after being claimed by the Blue Jays during Spring Training, he has now entered the conversation for a starting job.
Red Sox: Bogaerts warming up
One good sign for the Red Sox is that Xander Bogaerts is heating up at the plate. The rookie shortstop is 9-for-26 in his last seven games with a double, triple, homer and two RBIs.
"The thing that stands out with Xander is awareness, not only to his abilities but to the game situation," said Farrell. "To say that there was a drastic adjustment from one day to the next, I can't say that. He's gotten some pitches and he squared them up."
• Sox slugger David Ortiz has reached base in 18 of 19 home games since April 8, hitting .300 with five doubles, four homers, 14 RBIs and 12 walks.
• The Red Sox are the only AL team that has used no more than five starting pitchers this season.
• The Blue Jays sent right-hander Marcus Stroman to Triple-A Buffalo on Sunday. The 23-year-old had his contract selected by Toronto on May 3, and he made five relief outings for the team. He was 1-0 with a 12.79 ERA.
Jamie Ross is an associate reporter for MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.