Six of the best nine scores in the first round came at St. Andrews, including the rounds of Uihlein and Soderberg that featured fast starts in good conditions.
Soderberg birdied seven of his first eight holes to go out in 29, while all eight of the birdies by Uihlein — who plays on the LIV Golf circuit — were in the first 14 holes of the American’s bogey-free round.
Arnaus played at Carnoustie, where he birdied the five straight holes from No. 17 after starting at the 10th, and also eagled the par-5 14th hole.
Among the six players a shot off the lead was Nicolas Colsaerts, one of Europe’s vice captains at the Ryder Cup in Rome that ended Sunday with a 16 1/2-11 1/2 win over the Americans to regain the gold trophy.
Tommy Fleetwood — who won the clinching point for the Europeans at Marco Simone — Matt Fitzpatrick and Robert MacIntyre were straight back playing, with Fitzpatrick having the best score with a 67 at Carnoustie.
Fleetwood and MacIntyre also played at Carnoustie and shot 69 and 70, respectively.