Gushue moved into sole possession of first place at 4-0 while Jacobs fell to 3-1 in round-robin play.
John Epping defeated Matt Dunstone 9-7 and Brendan Bottcher earned his first win with a 10-2 rout of Mike McEwen, who fell into a third-place tie with the idle Kevin Koe at 2-1.
Jason Gunnlaugson outscored Tanner Horgan 11-6 in the other early game. After eight draws, Epping was 2-2, Gunnlaugson and Horgan were 1-2, Bottcher improved to 1-3 and Dunstone fell to 0-4.
A women’s round-robin draw is scheduled for Tuesday evening at SaskTel Centre. Jennifer Jones (4-0) was set to take on Kerri Einarson (2-2) in the showcase game.
The winners of Sunday’s finals will represent Canada at the Winter Olympic Games, Feb. 4-20, in Beijing.