CALEDON, Ontario. The RBC Canadian Open opened under a sky that moved and a wind that reminded the field of what precision costs. Morning showers gave way to afternoon clouds over TPC Toronto, the air pushing 84 degrees, the breeze crossing from the west at 8 to 14 miles per hour with gusts climbing to 22. These are conditions that separate the thoughtless from the intentional. When the day ended, six men stood alone at the top, each with a 6-under 64, and they had arrived there by very different routes.
The moment the round turned
Sahith Theegala's Thursday began the way his year has: with a lead he will carry into Friday. This is his fourth first-round lead on TOUR, and like the three before it, he made it count against the course. Theegala has never converted an 18-hole lead into a win, but he opened the Canadian Open with the kind of clean, unhurried round that speaks for itself: fairways found, greens kept, a 64 that asked nothing of luck and got everything it earned.
Emiliano Grillo matched the number from a different story. His 64 opened the 2026 Canadian Open with him inside the top of the field for the first time here since leading after 18 holes in 2015, an event he finished tied for 22nd. That opening position haunts golfers the way all missed opportunities do. He arrived this week with 284 TOUR starts and two titles on his résumé, good company for ambition and not enough yet to ease the hunger. Thursday gave him a fresh lead and a fresh argument.
The familiar names
Brooks Koepka's 64 was the week's loudest statement. He has held or shared 18-hole leads on TOUR nine times now, converted one into a PGA Championship in 2019, and carries the peculiar confidence of a man who finished in the top six of every event where he led after one round. His presence at the top is not surprise. It is simply the expected order reasserting itself.
Eric Cole and Sam Burns followed by the same score, each with his own arithmetic. Cole has never won on TOUR in 121 starts, a career line that reads like patience in someone else's hands and restraint in his own. Burns, by contrast, carries recent loss. He finished second at this tournament last year, defeated by Ryan Fox on the fourth playoff hole, a memory that travels with him. Winning this week would make him only the second player this season to rebound from a runner-up finish and capture the same tournament the next year. Thursday gave him the foundation for that story.
The story beneath the story
Matthew Anderson, the Mississauga, Ontario sponsor exemption making his fourth TOUR start, all of them here, arrived in Caledon after two years of work on the Korn Ferry Tour. His opening 64 lifted him past a previous best 18-hole position of T77, set at this event in 2024, and it marks his first lead of any kind on a major TOUR. He is the only first-time lead-holder in the group, a man who came to the Canadian Open out of belief and left the first day with evidence.
Twelve other players sit one shot back at 5-under, a group that spans from the hungry to the experienced. Tony Finau, a six-time winner, shares the second tier with David Skinns, 89 starts into a search for his first title, and Jimmy Stanger, just 30 starts in. Doug Ghim, Chandler Blanchet, and Patrick Fishburn join them in wanting the same thing as Finau. They want a win. The leaderboard will sort them out, but Thursday made clear that TPC Toronto has made room for almost anyone.
The players who did not move
Ryan Fox, the defending champion who walked in with evidence of how to win this tournament, settled into a tie for 19th at 4-under, two shots behind the lead. The course has already begun its work on him, asking the old question it always asks: are you still what you were?
Matt Fitzpatrick, the highest-ranked player in the field at No. 4 in the world, opened with a 67 to sit tied for 32nd, three shots adrift. His credential is the highest in the draw. His position, for now, is a passenger's. The weekend will answer whether he carries the form to match his ranking.
The shots that mattered
Christiaan Bezuidenhout stood on the 214-yard par-3 seventh and watched his tee shot settle into the cup. It was his first career hole-in-one on TOUR, a moment that belongs to the improbable and the rare. The ace gave him something to remember about Thursday, if the tournament remembers him for nothing else.
What tomorrow demands
Friday arrives with more wind and no reprieve from precision. The six leaders must prove Thursday was not the wind talking, that their games travel across rounds and days. The 12 at second are close enough that one clean card resets the leaderboard. The defending champion and the highest-ranked player must answer the course's opening question or find themselves looking up for the weekend.
The cut will come somewhere in the middle of the week, and it will ask for birdies that the course has made visible. TPC Toronto gave up 64s on Thursday. Friday will ask who can do it again.