Brooks Koepka picked up right where he left off.

A day after shooting 7-under 63 in Thursday's opening round around Bethpage Black, Koepka again started strong Friday at the PGA Championship.

The reigning PGA champ took an aggressive line at the par-4 fourth to set up an opening birdie.

To extend the #PGAChamp lead..... pic.twitter.com/pNunK545C1

— PGA Championship (@PGAChampionship) May 17, 2019

Koepka added a second straight birdie with a 9-foot make at the par-4 second.

Brooks Koepka update: 2 holes. 2 birdies.

?#PGAChamp pic.twitter.com/5SEuyxvToC

— PGA Championship (@PGAChampionship) May 17, 2019

And Koepka extended his lead to five shots with a two-putt birdie at the par-5 fourth hole.

An easy birdie for Brooks. Leads by 5.#PGAChamp pic.twitter.com/9D8eIYzkKt

— PGA Championship (@PGAChampionship) May 17, 2019

Koepka made four consecutive pars to close out his opening nine and then bogeyed the par-4 10th, his first dropped shot of the championship. But he got back to double-digits under par with this birdie at the par-5 13th.

Double digits again for Brooks.#PGAChamp pic.twitter.com/dGgTs33und

— PGA Championship (@PGAChampionship) May 17, 2019

He moved six clear of the field with a birdie at No. 15.

Dear Mr. Koepka. Are you for real?

Leads by 6. pic.twitter.com/26K3pWNfWH

— PGA Championship (@PGAChampionship) May 17, 2019

And then made it back-to-back birdies with another at No. 16. At 12 under par, Koepka was seven shots ahead of second place. He bogeyed the 17th hole, but rebounded with a birdie at the last.

Brooks Koepka is staring down another major!

Koepka carded a second-round 65 to set a 36-hole major scoring record (128) and holds a seven-stroke lead. ??? pic.twitter.com/FQuhrpV3Xv

— GOLF.com (@GOLF_com) May 17, 2019

Koepka finished with a 5-under 67 and, at 12 under for the championship, was seven up on second place.