Without spectators at the previous edition in August 2020 due to the COVID-19 pandemic, the PGA of America announced in February 2021 that 10,000 fans would be admitted daily.

[1] Phil Mickelson won his second PGA Championship and sixth major, two strokes ahead of runners-up Brooks Koepka and Louis Oosthuizen.

The PGA of America also issue invitations to players outside of these criteria,[6] which is generally seen to include the top one hundred in the world rankings.

[17][18] Friday, May 21, 2021 Phil Mickelson made five birdies over his last nine holes, including a 23-foot putt on the ninth (his 18th), to share the 36-hole lead with Louis Oosthuizen at five-under.

At the age of 50, Mickelson became the oldest player to lead the PGA Championship after the second round since Sam Snead in 1966.

Notables to miss the cut included Dustin Johnson and Justin Thomas, the two top players on the World Golf Rankings, as well as Cameron Tringale, who began the round inside the top 10 but shot 10-over 82 after suffering through a 12-over-par 48 on the back nine Friday (his front nine).

At the 12th, he hit his tee shot into a sandy area and had to chip out into the fairway, making his first bogey in 20 holes.

[30] Sunday, May 23, 2021 Phil Mickelson, at the age of 50, became the oldest golfer to win a major championship, shooting a one-over 73 to finish two shots ahead of Brooks Koepka and Louis Oosthuizen.

At the par-three fifth, Mickelson found a sandy area off the tee but holed his shot for a birdie.

Koepka was four-over between holes 7–13 before making birdies on the 15th and 16th, joining Oosthuizen at four-under after a two-over 74.

Mickelson saw his lead cut in half after also finding the water with his approach on 13, settling for a bogey before dropping another shot on the 14th.

At the 16th, he hit a 366-yard drive, the longest of any player on that hole all tournament, and got up-and-down from over the green for a birdie to get to seven-under.

[35][36] Final round Cumulative tournament scores, relative to par ESPN and CBS have the media rights to the 2021 PGA Championship.