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Louis Oosthuizen has always been a quality over quantity player, rarely playing more than 20 events a season and saving his best play for marquee events.

Reigning champion Dustin Johnson is favorite to win a fifth World Golf Championship (WGC) title this week in Mexico City where the world number one will stare down a strong field featuring six of the world's top 10 golfers.

England's Chris Paisley may not have been deemed worthy of a profile picture on the tournament website, but his name featured proudly near the top of the leaderboard after the first round of the WGC-Mexico Championship.

Oosthuizen carded five birdies and an eagle at Chapultepec Golf Club to set the clubhouse target at seven under, with Paisley one of three players a stroke off the pace on his World Golf Championship debut. "I've got a nice little cut going, and it's nice to be able to just aim left and swing away", Oosthuizen said. "I've been swinging it pretty good the last three, four weeks, felt I played really well last week".

He said he had misjudged the distances of some of his iron shots in the thin air, but not enough to cost him a bogey. "It's all about the ball flight you put on it".

World number two Jon Rahm is three off the pace after a 67, with fellow Spaniard and Masters champion Sergio Garcia a shot further back.

If Oosthuizen's lead was no surprise, Paisley's lofty position perhaps was unexpected. "The first 15 holes tee to green, I was really solid, hit a lot of fairways, a lot of greens. I'm obviously surprised I've gone out and shot six under and I'm in second place - that's kind of surpassed my expectations". "That's surpassed my expectations, but I was quietly confident I could have a good day".

Johnson, 33, has enjoyed plenty of success at WGC events and first won this tournament in 2015, when it was held at Trump National Doral in Miami.

Spain's Rafael Cabrera-Bello and Kiradech Aphibarnrat of Thailand, at 5-under, sit just two off the lead heading into Friday.

Among a group one back at six under is reigning Tour Championship victor Xander Schauffele, who also went bogey-free.

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