Hunter Mahan and Mark Wilson have set up an all-American semi-final after quarter-final victories at the WGC Match Play Championship.

Mahan destroyed countryman Matt Kuchar 6 and 5, ending it on the 13th hole.

It was the largest margin of victory for a quarter-final in the event’s history.

After the pair halved the opening two holes Kuchar dumped his tee ball on the third into the water allowing Mahan to take a lead he would never relinquish.

Pars on holes five through seven were enough to rocket to a 4-up lead as Kuchar’s game deserted him.

Wilson continued to be the somewhat silent assassin of the tournament taking down Swede Peter Hanson 4 and 3.

Wilson has now beaten Bo Van Pelt, Robert Rock, Dustin Johnson and Hanson without much fanfare to set up a semi-final against Mahan.

Hanson hadn’t trailed all week before the match but Wilson gave him a taste of it right out of the blocks when a par was good enough to go 1-up.

The pair halved the following four holes before Hanson squared up with a par on the sixth.

The pair ping-ponged the eighth and ninth with Wilson taking a lead with a birdie on eight before Hanson responded with birdie on the ninth leaving the match square at the turn.

Eyeball to eyeball throughout the opening nine it was Hanson who blinked first.

He bogeyed the next two holes allowing Wilson to take control with a 2-up advantage.

When Wilson nailed a four-foot putt for birdie on the 13th the lead was three holes and too much for Hanson to reel in.

He extended it further on the 14th hole and then closed out the match with a birdie on the 15th.

Northern Ireland’s Rory McIlroy is in a tough match with South Korean Sang-Moon Bae.

McIlroy won the opening hole but Bae, who knocked out Australia’s final hope John Senden in round three, squared up on the third when McIlroy found water.

The match is all square through seven holes.

England’s Lee Westwood is also back square after facing an early deficit against Scotland’s Martin Laird in the final quarter-final.

Laird nailed a six-foot birdie on the opening hole to grab a 1-up lead but Westwood grabbed one back on the sixth to square the match.