Rory McIlroy delivered his best opening round in a major since a 65 at the 2011 US Open which he had won for his first major title.
At 50 years, Mickelson wiped out the mark of oldest winner of a major that was set by Julius Boros, then 48, in the 1968 PGA Championship. Mickelson will turn 51 on June 16.
Since lifting the Claret Jug at St. Andrews in 2010, Oosthuizen has been a runner-up at the 2012 Masters, 2015 US and British Opens and 2017 PGA Championship.
The 103rd PGA Championship gets underway at Kiawah Island, South Carolina, with 10,000 spectators each day. Here are five players to watch at the year's second major golf tournament.
PGA of America president Jim Richerson says President Donald Trump's incitement of violence and encouragement of invading the US Capitol last week was more than reason enough to move the event.
The 23-year-old American, who began the day two shots back of overnight leader Dustin Johnson, shot a bogey-free six-under-par 64 to reach 13 under for the tournament.
A month after claiming his 15th major title at Augusta National, Woods crashed back to earth in his first tournament appearance since, recording a five-over 145 total at Bethpage Black.
Masters winner Tiger Woods will play with defending champion Brooks Koepka and British Open titleholder Francesco Molinari.
Brooks Koepka holds off inspired challenge from Tiger Woods and Adam Scott in a thrilling back-nine battle to win the 100th PGA Championship.
Ryan Moore clinched a thrilling triumph over Lee Westwood to end a long US wait to reclaim the golden trophy in golf's greatest team competition.
American Jimmy Walker won the Wanamaker Trophy with a one-stroke victory over defending champion Jason Day, taking his first major title in the PGA Championship.
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