Brad Jacobs and Bruce Mouat became the first teams to clinch quarterfinal berths at the HearingLife Tour Challenge curling tournament with wins in Thursday's third draw.

Jacobs and his Calgary foursome posted a 7-5 win over Winnipeg's Matt Dunstone while Mouat's rink from Scotland defeated reigning men's world champion Niklas Edin of Sweden 5-4.

Jacobs and Mouat both improved to 3-0 at the triple elimination event, which is kicking off the Grand Slam of Curling season.

In other results from Thursday's third draw, John Shuster eliminated fellow American Korey Dropkin with an 8-3 win, and Scotland's Cameron Bryce ended Reid Carruthers' tournament with a 6-2 win over the Winnipeg skip.

In earlier men's action, Schwaller defeated fellow Swiss skip Michael Brunner 5-2, Calgary's Kevin Koe downed Canadian men's champion Brad Gushue of St. John's, N.L., 7-4, Scotland's Ross Whyte beat Italy's Joel Retornaz 6-4 and McEwen downed Scotland's James Craik 7-2.

WATCH | McEwen joins That Curling Show to discuss hot start to the season:

'They brought out something special': Mike McEwen credits teammates for hot start to season

Mike McEwen has been red hot to start the curling season. The skip joined Devin Heroux to explain the early success behind the three-straight event wins.

Koe will face Whyte for a quarterfinal berth on Friday. Gushue will face Bryce and Retornaz will meet Shuster, with the winners staying alive and the losers going home.

Homan and Schwaller will play for a quarterfinal berth on Friday, while Einarson and Wrana will also look to advance against opponents to be determined in Thursday's evening draw.

The day's final draw consisted of two direct entries into the women's quarterfinals.

Italy's Stefania Constantini topped Tabitha Peterson of the United States 7-6, scoring the winning single in the eighth and final end to earn an entry. South Korea's Gim Eun-Ji defeated Winnipeg's Kaitlyn Lawes 7-4 to grab the other entry.

In the other two games, Winnipeg's Chelsea Carey cruised past Delaney Strouse of the U.S. 10-1, while Scotland's Rebecca Morrison squeezed past Edmonton's Selena Sturmay 4-3.