"I'm looking forward to washing that away and just shoving my next outing," Buchanan said after a 6-2 loss to the Red Sox at Citizens Bank Park.
Buchanan posted a 3.75 ERA in 20 starts during a solid rookie season in 2014. He allowed three earned runs or fewer in his final 16 starts, which was the fourth-longest active streak in the big leagues behind the Dodgers' Clayton Kershaw (24), the Cubs' Jon Lester (20) and the Cardinals' Lance Lynn (17).
But after posting a 1.29 ERA and allowing just 14 hits and two walks in 21 innings in Spring Training, he allowed seven hits, six runs and four walks in just three innings Thursday.
Buchanan had a problem finishing innings. He retired the first two batters he faced in the first inning before walking David Ortiz with two outs. He had two outs and nobody on base in the second when he walked Xander Bogaerts.
But the third inning hurt the most. He retired the first two batters he faced before Ortiz reached on a single to shallow right field. Chase Utley was positioned for the defensive shift, but couldn't handle a ball hit to his right. Hanley Ramirez then hit a ball over the mound, which Buchanan fielded. But he spun and fired the ball into the camera well down the first-base line to put runners on second and third.
"I don't know if I had made a good throw if he would have been out or not," Buchanan said. "But fielding my position is part of it. I think I could have gathered myself and tried to make a good throw."
Buchanan walked Pablo Sandoval to load the bases. Shane Victorino then hit a ball to third baseman Cody Asche, who backed up to make the play. He looked to throw to second before firing a throw late to first.
Ortiz scored to make it 1-0.
Ryan Hanigan walked to score Ramirez to make it 2-0 and Bogaerts hit a triple down the right-field line to clear the bases and hand Boston a 5-0 lead. Red Sox pitcher Justin Masterson added insult to injury with a single to center to score Bogaerts and make it 6-0.
"That inning can't happen," Buchanan said. "Two outs, no runs have scored yet. You've got an open base and you end up walking a guy. You deserve what's coming if you keep doing that."
Buchanan will pitch again Tuesday in New York against the Mets. He will be looking for his first win since Aug. 8.
"I just want to get past the third inning," he said.