Two-time US PGA Championship winner Brooks Koepka has rated his second day performance at this year's event as a "C-plus" despite remaining firmly in contention at the halfway mark.
Koepka shot a three-under-par 69 on Thursday for a tie for second, before a one-under 71 on Friday at the Ocean Course at Kiawah Island in South Carolina.
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The four-time major winner remains second, one shot behind joint leaders Phil Mickelson and Louis Oosthuizen who carded 69 and 68 respectively on Friday.
Koepka, who has been battling a knee issue, bogeyed twice in his opening six holes on Friday, before an eagle on the seventh got him back on an even ledger.
He eagled the 11th, birdied the 12th before bogeys on the 15th and 17th, needing a big putt on the 18th to finish one-under for the day.
"C-plus. I missed that short one on four, missed a short one there again on 16," Koepka said. "I thought I struck it great. I drove it a lot better but it's tough to putt in this wind.
"Sometimes you're playing the wind, and sometimes you don't. The wind might take it a little bit, but you're also not trying to firm it either, and have another three-footer coming back.
"I understand everybody else is probably going to miss a few short ones with this wind, but I ball struck my way around this golf course.
"One-under in these conditions, it's okay."
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Koepka has battled injuries since his back-to-back PGA Championship titles, having undergone knee surgery in March.
The 31-year-old American had missed the cut in his past two events, including last month's Masters, but insisted injury would not be an issue this week.
"It's a major. It's going to be tough, especially with the wind blowing," he said. "It doesn't matter, just go out and go play.
He added: "This was all easy. Everything I did in rehab was a hell of a lot harder, I can promise you that."
