Well, OBP is more important than SLG when determining runs, and while the Cubs haven't given up a ton of SLG or OPS, that is only because of the low BAA. Way too many of the hits they have allowed have been HR, which is the 2nd killer, along with walks allowed, that has caused this staff to perform so poorly. I think it would be a mistake to think luck has played much of a part in this, and/or it will turn next year. The Cubs are allowing a .258 BAA overall, and it's .265 with RISP. I don't think you can look at the relative rankings you listed, and then say they've given up 30 more runs than they should have. Let me be a bit more clear on my angle, because I feel there is a stronger emphasis on OPS than OBP when correlating Runs scored. When you look at offensive numbers, there is nearly a direct correlation between OPS and Runs Scored. For example, all of the teams in the top 9 for runs scored in the NL are in the top 9 for OPS, and the order only shifts slightly, with teams within 2 in ranking across the board. As expected therefore, the teams with the lowest OPS are also worst in Runs Scored As we would expect, the reverse is true when evaluating the stats from the pitching perspective. The 5 teams in the NL with the lowest OPS against are also the 5 teams that have given up the fewest Runs Scored. There are no anamolies on offense. But there are two teams with anamolies on the pitching side - The Cubs and the Brewers. Each has given up more Runs Scored than the OPS against would suggest. Maybe I am just allowing my optomism for the future to shine through, but it really seems to me that more runs are scoring than the mean would suggest. It sounds like you are overcomplicating things to make the Cubs look better than they are. They give up the most walks, and almost the most HR. But they also strike out the most. That is why they appear to give up "too many" runs per hit. The hits they do give up are big hits, and the walks mean more of those HR are with runners on base. It's just the same as batting. A team can be lucky one year, and have a high RISP one year. Look at Washington and San Fransisco this year for example San Fransisco-.328 OBP, .421 SLG, 749 OPS Washington-.340 OBP, .422 SLG, .762 Which team should score more runs? Obviously Washington-but San Fran has them by 2 runs this season-Here is the reason Why In Scoring Position San Fransisco-.368 OBP, .440 SLG, .808 OPS Washington-.353 OBP, .394 SLG, .747 OPS Of course, we know RISP isn't sustainable. So, Washington should have a better offense next year if they keep the same people. The same applies to pitching-here are two more teams. Cubs-.344 OBP/.435 SLG/.779 OPS Pittsburgh-.362 OBP/.440 SLG/.802 OPS The Cubs would be expected to give up less runs in this scenario-but they haven't (Pittsburgh has given up 21 less runs). Why? Scoring Position Pittsburgh-.367 OBP/.406 SLG/.773 SLG Cubs-.366 OBP/.429 SLG/.795 SLG The Cubs have given up a much greater percentage of XBH in key situations this year, even though Pittsburgh has given up many more runners. Again, stats with RISP are not sustainable-so the Cubs should have better pitching than the Pirates next season (if the teams had remained the same). The answer is yes-the Cubs have had a bad pitching staff this year, but their total number of runs is greater than their OBP, SLG, and OPS would seem to suggest.