Dustin Johnson remains on course at WGC-Dell Match Play

World number one Dustin Johnson is through to the quarter-final stage of the WGC-Dell Match Play event in Texas thanks to victory over Zach Johnson.

The 32-year-old came out on top 5&4 against his American compatriot in Saturday's last-16 tie, joining five-time Major champion Phil Mickelson in the next round.

Mickelson claimed an equally impressive win by downing Marc Leishman 4&3, and there is also a place in the last eight for Bill Haas, who eliminated Kevin Na 1 Up.

Elsewhere, Alex Noren beat Brooks Koepka 3&1 and outsider Soren Kjeldsen came out on top 5&4 in his battle with William McGirt.

Ross Fisher is flying the flag for England after setting up a quarter-final with Japan's Hideto Tanihara later on Saturday evening.