Dustin Johnson leads Open after superb 65 as he chases major redemption

• American opens with only his third bogey-free round in big four tournaments
• Zach Johnson, Paul Lawrie, Danny Willett, Robert Streb and Jason Day hit 66It will take until Dustin Johnson is on the 72nd green again and in position to win a major championship to determine whether mental scar tissue from Chambers Bay exists. That chance will inevitably arise, such is the level of Johnson’s talent and his propensity to place himself in contention. Related: Jordan Spieth settles into his groo