This one could be the hardest because there are so many. And there were also some we don't want to remember,lol (2011,1978,1974) There are many 88,86,90,2013,2003. In 04 by Early September we knew they were in the playoffs so that wouldn't be one-IMO. For me it comes down to 90 and 03. One they had to win the division the other was for a wild card spot. My choice 1990. Early September they were 5 or 6 up I believe, but less then 2 weeks later I think they were tied or behind. I remember losing to the Indians the last week but the lead staying at 1 1/2 because the Brewers beat the Jays. They saved us. And of course capped off by that wild Friday night game against the Jays capped off by Jeff Stone's only Red Sox hit. They clinched it in October on Brunansky's catch. That Jeff Stone game is one of my favorite all time Red Sox games. That whole year was also fun and crazy. Win 8 in a row, lose 6 in a row. 1967 is as good as any September, but I try to not go with the obvious. But if 67 is your favorite I can't argue. I was only ten so I couldn't stay up late like my teen and adult years. If I had to say what was the happiest it was 86. They pulled away by the 2nd week winning 11 in a row and I kept pinching myself, they're going to win the division, they're not going to blow it.