Cook took down Baxter House of the Gateway Curling Club during Draw 2 action, picking up a 5-2 win.
He — alongside Marchetta Gallant, Barry Lomond and Debbie Noonan — amassed single points in the third, fourth, fifth, sixth and seventh ends.
House — along with rinkmates Susan Thomas, Dave Thomas and Lorna Penney — had previously recorded points in the first and second ends.
Earlier in the day, Cook defeated clubmate Paul Grenier and his rink, consisting of Sherri Kinsman, Brian Kinsman and Carolyn Grenier, by a 12-1 score.
Cook had a big three points in the second end, to go with deuces in the third, fifth and eighth ends and single points in the first and sixth.
Grenier picked up his sole point in the seventh.
Buckle, meanwhile, downed his clubmate Gary Oke 8-5 in Draw 2 for his second win of the day.
A three-point first end got things going early for the Buckle rink, which also features Diane Graff, Blair Fradsham and Donna Davis. He then notched two points in both the third and seventh ends, to go with a single in the fifth.
Oke had deuces in the second and sixth, as well as a single in the fourth.
Buckle earned his first win to the tune of 6-3 over Neil Power of St. John’s.
The eighth end was his best, where he produced two points, after garnering singles in the first, fifth, sixth and seventh ends.
Also among the leaders is Chris Ford of St. John’s, who is 2-0 after a 6-3 win over Oke and a 14-2 triumph against David Power of the Gateway Curling Club.
Other scores from Tuesday were: Kenny Young (Corner Brook) 9, David Power 2; and Neil Power 13, Grenier 4.