SPX closed the week at 4131.92. SPX closed very near the previous low of 4115. Look for this area to be a decisve fighting ground this week. SPX tested and rejected hard off of the 4300 area last week, and now can test lower underneath 4115 if more sell-side momentum is found. We should see a more definitive look on SPX after Tuesday. If SPX can set up in either direction, we should be able to see follow through the rest of the week. SPX critical levels are 4115 and 4300 to watch this week. Levels in between can serve as areas to daytrade off of.