Leigh McKenchie leads the Mack Hall Cottesloe Open while Peter Fowler is on top in the Senior Invitational with both run simultaneously this weekend.

Players starting early took advantage of Cottesloe Golf Club on a magical Perth morning with 12 players finishing their round under par while the later groups only gave up four sub-par rounds.

McKechnie, clubhouse leader with 6-under 66 was in doubt to tee it up when he awoke with a bout of Vertigo, something he has battled over his career.

“I went out with low expectations and it has clearly worked. I have an exercise that helps to relieve me of it and it is definitely what helped me to play the round," McKenchie said

"I’d been playing great leading in to this event and was looking forward to playing this event knowing how good this course is, it once again hasn’t disappointed"

Fresh off a win in Friday's Westcoast Wines Ronald McDonald House Hartfield Pro Am winner Matt Millar is tied second on 4-under with WA’s Matt Jager.

Millar, who was a winner alongside Rory Bourke, was glowing of the Hartfield course and has carried his form in to this weekend.

“It’s the first time my schedule has allowed me to play here and I will definitely be back, the Hartfield course is a hidden gem and something the members should be very proud of," Millar said.

Simon Lidell and Haydn Barron recorded a hole-in-one each on the Cottesloe layout.

The Mack Hall Cottesloe Open has a rich history dating back to inaugural year in 1948, with players previously winning Graham Marsh, Terry Gale Rodger Mckay, Stephen Leaney, Greg Chalmers and of recent years Michael Long.

Run in conjunction with the Mack Hall Senior Invitational, some of Australia's best golfers in Wayne Grady, Mike Harwood, Peter Fowler, Terry gale, Brian Jones and Michael Clayton share the course with young up and comers like Min Woo Lee and

Today's second round starts from 7am local time with the leading groups teeing off at 12.30pm.