Matt Fitzpatrick and brother Alex one stroke off the lead at the Zurich Classic of New Orleans

Matt Fitzpatrick and his brother Alex shot a four-ball round of 62 on Thursday at the Zurich Classic of New Orleans to sit one stroke off the lead through 18 holes in the unique format.

The only duos event on the PGA Tour calendar, the pairs of Wyndham Clark with Beau Hossler and Sean O'Hair with Brandon Matthews took the first-round lead with 11-under 61s as each member played every hole, with only the best score from each hole counting towards their team's score.

Hossler contributed seven of his team's 11 birdies, while Matthews had five birdies and an eagle for his pairing.

The Fitzpatrick brothers poured in five birdies each to earn a spot in the five-way tie for second place, joined by the teams of Keith Mitchell with Im Sung-jae, David Lipski with Aaron Rai, Henrik Norlander with Luke List, and Noh Seung-yul with Michael Kim.

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Last year's runners-up Sam Burns and Billy Horschel are three strokes off the pace in a logjam at eight under, while one of the strongest teams in the field featuring world number 13 Collin Morikawa and world number seven Max Homa are tied for 43rd at six under.

Reigning champions Xander Schauffele and Patrick Cantlay were disappointing, two strokes outside of the cut-line at five under, but they will hope to claw their way back into things when the format switches to alternate shot foursomes on Friday.