BOSTON — It was hard to play much worse than the Boston Red Sox did while losing on Thursday at Fenway Park. They blew a four-run lead, made three errors and ran the bases poorly, and their $95 million free-agent switch-hitter, Pablo Sandoval, went 0 for 4 while batting left-handed against left-handed pitchers. The forgiving American League East standings, at least, give the Red Sox hope. And as badly as they looked at the end of their four-game series with Minnesota, their pitchers did string together four quality starts. A group that looked overmatched early has settled down under a new pitching coach, Carl Willis.