The winner of the 2019 edition took two strokes ahead at the top of the ranking. Meanwhile, Chilean Niemann, the only South American in the tournament, is among the last.
Brooks Koepka had a dream start to his title defense in the WGC-FedEx St. Jude Invitational, after matching his lowest round in the PGA Tour with 62 hits.
The American managed nine birdies and one bogey this Thursday in Memphis, to reach the top with eight under par and two above his compatriots Rickie Fowler and Brendon Todd.
South Korean Kang Sung-hoon is fourth with 65 shots (-5), one shot ahead of ocals Justin Thomas, Matt Kuchar, Chez Reavie and Max Homa, while Phil Mickelson, Spaniard Sergio Garcia and Mexican Abraham Ancer. they are in the ninth place lot (-3).
For his part, the Chilean Joaquín Niemann, the only South American in the competition, managed two double bogeys, on holes 5 and 8, a pair of bogeys and three birdies that left him with a card of 73 strokes (+3) to stay in the bottom of the classification.
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