Denmark’s Thorbjorn Olesen and PGA Tour rookie Cristobal Del Solar of Chile each posted a 9-under-par 61 to share the first-round lead at the RBC Canadian Open on Thursday in Caledon, Ontario.

Olesen and Del Solar took full advantage of TPC Toronto at Osprey Valley in the venue’s PGA Tour debut. They own a one-shot lead over Cameron Champ; Jake Knapp is alone in fourth at 7-under 63.

Shane Lowry of Ireland went out in 5-under 30 on his way to a round of 64. He is tied for fifth with Rasmus Hojgaard of Denmark and Trey Mullinax.

The low Canadian for the day was Taylor Pendrith (65), who set the clubhouse lead in the morning wave before several players passed him by. Defending champion Robert MacIntyre of Scotland is among the several golfers knotted with him in eighth place at 5 under.

Del Solar birdied 10 of his first 16 holes to pass Olesen for the outright lead and threaten a score of 59. However, he failed to get up and down from the bunker at the par-4 17th hole and took his only bogey of the day. He missed a 15-foot putt for birdie for the outright lead at No. 18.

Del Solar’s claim to fame is a round of 57 he shot on the Korn Ferry Tour in February 2024. It was the lowest round ever recorded in a PGA Tour-sanctioned tournament.

Olesen, meanwhile, has eight wins on the DP World Tour but is seeking his first title in the United States.

Two-time Canadian champion Rory McIlroy is in danger of missing the cut after shooting a 1-over 71, which he ended with consecutive bogeys at Nos. 8 and 9. The Northern Irishman is playing for the first time since a T47 finish at the PGA Championship.