Open Championship - Update: Phil Mickelson Leads Field By 3 Strokes After Round 1

American Phil Mickelson shot an opening round -8 under par to finish Round 1 three strokes ahead of Germany's Martin Kaymer and America's Patrick Reed. Kaymer and Reed are both Olympic-bound. Meanwhile, defending champion Zach Johnson sites at -4 under par. Scotland's own Colin Montgomerie had the honour of hitting the opening tee shot of The 145th Open at Royal Troon today. this week’s Open promises to deliver a measure of competitive clarity to a season defined by distractions and dissension. And the wildly premature declarations of a Big 3 have at least been tempered by parity and a party crasher. If Jason Day is the byproduct of Jordan Spieth and Rory McIlroy as the Australian joked last year, Dustin Johnson has evolved into a freakish hybrid of all three in recent weeks. Johnson overcame the demons of past major misses at Oakmont last month, with or without a one-stroke penalty, and added a World Golf Championship to his resume in his follow-up start. That Johnson seems just as adept on the links of Scotland as he is on the fields of Oakmont only makes his status as a potential game-changer that much more imposing. Last year at St. Andrews, Spieth was paired with Johnson for two deflating days and watched as DJ took a one-stroke lead after opening with rounds of 65-69. “I played with Dustin the first two rounds and thought, 'Man, there’s nobody beating him this week,'” Spieth said. “He was just absolutely tearing it up.” But as impressive as Johnson’s run has been, the other members of golf’s foursome de jour could just as easily be considered the favorite, including McIlory, the 2014 champ who was dubbed the Ringo Starr of the game’s Fab Four by some in the U.K. media this week. Which player(s) has the advantage moving into a predicted rainy and windy Round 2? Share your pick's with the Pro Golf Tour.