Preview of this weekend's key Premier League matches

QPR  vs. Chelsea (4.50)Chelsea will be looking to extend their perfect start to the season against QPR at Loftus Road.  Rangers have had a brutal start to the season and it isn't likely to improve.  They were handed a 0-5 drubbing against Swansea to start the season, and after drawing 1-1 with Norwich, City beat them 3-1.  Zamora has scored both of QPR's goals.Chelsea are off to an excellent start and have beaten all three teams they've played by two goals, while keeping clean sheets against New Castle and Wigan.  They were defeated 1-4 in the UEFA Super Cup last week, conceding a hat trick to Falcao, but should have an easy time of it on Saturday.  Fernando Torres appears to have finally found his form, and should trouble the defense all afternoon.Manche...