Mackenzie Hughes is in contention at the RBC Canadian Open.

The native of Hamilton, Ont., was the top Canadian in Round 1 of the only PGA Tour stop north of the border and finds himself tied for fifth after shooting an impressive 4-under 66 Thursday at St. George's Golf & Country Club in Toronto.

Starting on the back nine, Hughes, 31, was one of the first to tee off, scoring an eagle on the Par 5 11th hole. He would add birdies on the second, sixth and ninth holes, as well as a lone bogey on hole four. 

Hughes is just three shots back of leader Wyndham Clark who posted a score of 63.

Adam Hadwin of Moose Jaw, Sask., also put together a strong opening round on Thursday. The 34-year-old scored four birdies and three bogeys for a 1-under 69 which has him tied for 26th. 

Winnipeg's Nick Taylor bogeyed two of his last three holes to finish at an even-par 70. 

Listowel's Corey Conners, who had the best betting odds among Canadians to win the tournament heading into the Canadian Open, shot a 1-over 71 after a four-bogey performance. 

Mike Weir of Sarnia shot a 2-over 72. 

Other Canadians in the field included Calgary's Jared du Toit (1-over), Digby, N.S.'s Myles Creighton (2-over), North Vancouver, B.C.'s Callum Davison (6-over), Cambridge, Ont.'s Brendan Leonard (8-over) and amateur Max Sekulic (5-over).

Pat Fletcher was last Canadian to win this tournament 68 years ago.