Tonight at 7:10, the Mets begin a four-game series with the Rockies at Citi Field.The Rockies come into this series with a 46-73 record, leaving them with the second worst record in baseball. Despite a roster that includes Carlos Gonzalez, Todd Helton, and Troy Tulowitzki, they have been awful all year. However, the offense hasn't been the cause of their struggles. It's been the pitching.The Rockies have a 5.41 staff ERA, last in baseball by more than half a run. Part of this has been the team messing around with the starting rotation. Jim Tracy implemented a system earlier this year where pitchers would be on a 75-pitch limit, but would start every four days, as opposed to five. This has thrown off their starters (who weren't very good anyway). Rockies starters have a combined 6.22 ERA this year, last in the majors.On offense, the overall numbers look very good for the Rockies. However, when you look deeper, you discover that it is clearly a product of their home ballpark.The offense has only two real threats currently in their lineup: Dexter Fowler and Carlos Gonzalez. Fowler is having a breakout year for Colorado, hitting .302 with 12 home runs and a .387 on-base percentage, all career-highs. Gonzales has been one of the best hitters in baseball this year, hitting .320 with 20 home runs and a .389 OBP. However, both have struggled on the road. Gonzalez has a .242/.312/.414 batting line on the road. Fowler's is only slightly better: .266/.317/.403. I think you get the point: the Rockies can't hit on the road.Even though the Mets themselves are a mediocre third place team, this series should be very easy for them when you consider how bad the opposing pitching staff is and how the Rockies have failed to hit outside of Coors Field this season. But didn't we say the same thing about the Astros and Cubs?