BOSTON—A long road trip seemed to finally catch up to the Mariners on a wet, sloppy night in which they always seemed a step or two shy of making the needed plays. Ryan Langerhans was the most obvious culprit in left field, dropping a shallow pop up down the line and then accidentally knocking the ball into the stands for a two-base error in the fifth inning that led to three unearned runs. But this 6-3 loss to the Boston Red Sox on Monday night wasn’t a result of just the Langerhans play. After all, a pair of errors by the Red Sox helped keep the Mariners in the contest that was tied in the latter innings. Instead, it was a pair of grounders that just got past Seattle infielders in a three-run seventh inning, aided by ineffective relief pitching from Sean White, that eventually sealed Seattle’s doom. Mariners starter Doug Fister was into his seventh inning of work at Fenway Park when second baseman Chone Figgins just failed to get his glove on a hard roller up the middle by Jed Lowrie. Right after that, Daniel Nava hit a ball to the left side of the infield that shortstop Chris Woodward nearly leaned over the top of but had go on by him for another hit. A sacrifice fly moved both runners over. White came in from there and yielded a go-ahead, two-run single to Marco Scutaro that gave Boston a 5-3 lead. Scutaro, who drove in four on the night, took third on an ensuing single, then scored on a sacrifice fly for the final Boston run. Boston starter John Lackey went eight innings, allowing three runs—two earned—while striking out 11 for the victory. For most of a rainy, unseasonably cool day in this city, it seemed doubtful the game would even be played. Crews finally took the tarps off the field an hour before game time, then put them back on until right before the first pitch. The wet conditions may have impacted the fielding to a degree. Jed Lowrie helped the Mariners to their first run by booting what became an infield single for Figgins—who had three of Seattle’s seven hits—in the fifth inning. But then the Langerhans error in the fifth on a pop fly down the line by Lowrie opened the door to three Boston runs. The error put runners on second and third with one out. With the bases loaded and two out, Scutaro singled to right field to score a pair of runs and put Seattle in a 3-1 deficit. But the Mariners opened the sixth with a pair of singles off Lackey. With one out, Franklin Gutierrez sent a grounder toward the mound that Lackey bent to pick up, but then bobbled for an error. That loaded the bases and Casey Kotchman quickly tied it up with a two-run single to right that sent Gutierrez to third with a chance to add more runs. But then Gutierrez took too big a lead off third and got nailed in a rundown as Adam Moore chopped a ball right at the third baseman. Just another missed play on a night the Mariners, now into the fourth and final leg of a season-long road trip, always seemed a step or two behind their opponent.