That need for concentration at the Derbyshire venue extended beyond 36 holes – an extra one was needed to defeat Suzanne Dickens in a play-off and win the tournament and the trip to the USA.
Not that MacKenzie, a PGA Master Professional, was surprised by her success.
“When I introduced Jess to Ping a couple of years back, I told them she was a future Women’s PGA Cup player,” he recalls. “And she’s done it at the first attempt.”
Neither was he amazed that the person who joined him four years ago held her nerve at the business end of the WPGA’s most prestigious tournament.
“Her demeanour doesn’t change from the moment she arrives at the pro shop in the morning to the time she leaves in the evening,” he adds. “I wouldn’t fancy playing poker with her!”