The only golfer to birdie No. 11 at the Masters on Saturday wasn't even in the tournament

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The 11th hole at Augusta National Golf Club wasn't kind to the field on Saturday at the Masters.

The menacing, 505-yard par 4 that kick starts Amen Corner is a constant nuisance for players, especially as the drama builds on the weekend. The hole played so tough on Saturday that it surrendered just one birdie on the day.

But according to official Masters stats, that birdie won't count against it.

That's because the golfer who did make birdie on No. 11 wasn't even in the tournament. He was simply the non-competitive marker who played the round with Paul Casey in the first group out Saturday morning.

There was only 1 birdie today at 11: Jeff Knox, the non-competing marker playing with @Paul_Casey. #TheMasters — Grant Boone (@grantboone) April 7, 2018

If you're a fan of the Masters, you know Jeff Knox's name. He's a member at Augusta National who has served as the non-competitive marker for several years now. In 2016, he was paired up for a round with Bubba Watson.

He holds the club's record from the member's tees with a 61. And he is part of the committee that plans the pin placements for the greens during Masters play.

But for one day, at least, he did something better than 53 of the best golfers in the world.

Casey spent much of his press briefing on Saturday answering questions about Knox.

"He's very good," Casey said, according to Golf Digest. "He birdied 11. Brilliant birdie."

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