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Smile for the camera Tiger. PHOTO: Matthew Harris/Golf Picture Library

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Jordan Spieth fires a long approach into a green early in his round. PHOTO: Matthew Harris/Golf Picture Library

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Tiger Woods hits his third shot into the long par-5 13th hole. PHOTO: Matthew Harris/Golf Picture Library

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First round leader Rory McIlroy recovers from the sand. PHOTO: Matthew Harris/Golf Picture Library

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Jordan Spieth narrowly misses this par saver. PHOTO: Matthew Harris/Golf Picture Library

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Rory McIlroy hits this tee shot over the gallery. PHOTO: Matthew Harris/Golf Picture Library

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Tiger wasn't happy with this tee shot. PHOTO: Matthew Harris/Golf Picture Library.

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Rory in full flight. PHOTO: Matthew Harris/Golf Picture Library.

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Cam Smith plays a recovery from one of Southern Hills' infamous bunkers. PHOTO: Matthew Harris/Golf Picture Library.

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Standing room only as Rory hits his approach on the 17th hole. PHOTO: Matthew Harris/Golf Picture Library.

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Tiger rues another missed birdie opportunity. PHOTO: Matthew Harris/Golf Picture Library.

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Cam Smith in full flight en route to a two under 68. PHOTO: Matthew Harris/Golf Picture Library.

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Will Zalatoris is one stroke from the lead after a four under 66. PHOTO: Matthew Harris/Golf Picture Library.

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Sweaty work for the 2021 Masters Champion, Hideki Matsuyama. PHOTO: Matthew Harris/Golf Picture Library.

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What a position! Hideki Matsuyama poised to let one rip. PHOTO: Matthew Harris/Golf Picture Library.

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1991 PGA Champion John Daly had the honour of hitting the first tee shot. PHOTO: Getty Images.

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What they're chasing ... the huge Wanamaker Trophy. PHOTO: Getty Images.

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John Daly hits his approach on the 4th hole. He opened with a two over 72. PHOTO: Getty Images.

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Cam Smith follows the flight of his drive off the 10th tee. PHOTO: Getty Images.

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Cam Davis miscues a drive off the 3rd tee. PHOTO: Getty Images.

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Thomas Pieters gouges a shot out of the water hazard on the 4th hole. PHOTO: Getty Images.

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John Daly has been allowed to use a cart this week. PHOTO: Getty Images.

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Rory tosses his putter after missing a birdie putt. PHOTO: Getty Images.

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Jordan Spieth holds the clubface open on this shot from the rough. PHOTO: Getty Images.

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Will Zalatoris nails this approach into the 4th green. PHOTO: Getty Images.

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Tiger Woods grimaces with pain walking off the 8th tee. PHOTO: Getty Images.

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Ouch! PHOTO: Getty Images.

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Viktor Hovland hits his tee shot on 10. He opened with an even par 70. PHOTO: Getty Images.

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It was a full house wherever Tiger Woods was on course. PHOTO: Getty Images.

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Tiger's right leg flared up in pain after his tee shot on the 8th hole. PHOTO: Getty Images.

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Rory plays a long bunker shot on the 5th hole. He got up and down for birdie. PHOTO: Getty Images.

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Spieth in limbo mode reading this putt. PHOTO: Getty Images.

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Cam Smith hits a good drive on 13 to set up a birdie. PHOTO: Getty Images.

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There were Tiger fans everywhere on day one. PHOTO: Getty Images.

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Massive crowds followed the marquee group of Tiger, Rory and Spieth. PHOTO: Getty Images.

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Shane Lowry digs one deep out of the sand. PHOTO: Getty Images.

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The Goodyear blimp hovers over Southern Hills. PHOTO: Getty Images.

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Adam Scott had plenty of sand trouble in his opening round. PHOTO: Getty Images.

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Justin Thomas sweeps some of the gravelly sand off his putting line. PHOTO: Getty Images.

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Tiger hits his approach into the 18th green. PHOTO: Getty Images.

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World No.1 Scottie Scheffler misses this drive to the left. He opened with a one over 71. PHOTO: Getty Images.

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Scheffler made light work of this recovery and saved his par on the long par-3 8th. PHOTO: Getty Images.

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In the zone ... Lucas Herbert and Old Tom Morris look-a-like and caddie, Nick Pugh. PHOTO: Getty Images.

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Korea's Joohyung Kim misses with this approach into the 16th. PHOTO: Getty Images.

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Jason Day was solid on day one and finished with a one over par 71. PHOTO: Getty Images.

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Rickie Fowler practices his levitation trick. He opened with a 71. PHOTO: Getty Images.

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Lucas Herbert plays another impressive bunker shot. PHOTO: Getty Images.

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Adam Scott looks for his ball in the creek beside the 17th hole. He ultimately tapped in for a quadruple bogey 8 and signed for a seven over 77. PHOTO: Getty Images.

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Hot day at the office for Justin Thomas. He opened with a 67. PHOTO: Getty Images.

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Henrik Stenson as playful as ever. PHOTO: Getty Images.

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Not happy Jon!!. Rahm looks for his ball in the hazard beside the 17th hole. PHOTO: Getty Images.