Tiger Woods began his title defense in the Bridgestone Invitational with a perfect tee shot down the middle of the fairway and a shot that covered the flag until it settled 10 feet behind the hole. Marc Leishman had eight birdies in his round of 64 to take a one-shot lead after one day at Firestone, and more than one-third of the field in this World Golf Championship broke par in soft, relatively gentle conditions. For such a big tournament, the Bridgestone Invitational got off to a quiet start. Most of the attention was on Woods and his game, on who might make the Ryder Cup team, on who appears to be rounding into form for the PGA Championship, and on Dustin Johnson announcing he was taking a leave from golf for what he called ''personal challenge'' that will require ''professional help.'' Here are five things to look for going into Friday's second round at Firestone. More...