Phil Mickelson, looking to become the oldest player to win a major, entered the final round of the PGA Championship with a one-shot lead over Brooks Koepka. By the turn, Mickelson's lead was two.
Here's how a frenetic front nine played out on the Ocean Course:
On the first hole, the 50-year-old Mickelson three-putted the first green while Koepka made birdie. Koepka led by one at 7 under.
Then after a two-shot swing in Koepka's favor at the first, there was a three-shot swing in Mickelson's favor at the second.
After Mickelson quickly lost his anticipated lead, there was a three-shot swing in Mickelson's favor at the second.