AKRON, Ohio – The dog days of summer must be Carl Petterson’s time of year. The Swede, who became an American citizen in January, won the RBC Canadian Open – which was played last week -- two years ago. He’s the 2008 winner of the Wyndham Championship, which is two weeks on the horizon, as well. So maybe it should come as no surprise to see Pettersson, who won the RBC Heritage earlier this year, at the top of the leaderboard at the World Golf Championships-Bridgestone Invitational. He’s played 14 holes in 4 under and has yet to make a bogey. K.T. Kim and Charl Schwartzel, who are playing in successive groups, and have just made the turn, are one stroke back. Retief Goosen, Lee Westwood and Keegan Bradley are tied at 2 under. Goosen needs a big week. He came to Firestone Country Club ranked 139th in the FedExCup and could use a big push to finish in the top 125 and make the Playoffs.