The 43-year-old Kings Links, Aberdeen tour pro led a charge of sub-par scorers – 21 in all – on the opening day of the three-day, 72-hole Tartan Tour major at Meldrum House Golf Club, Oldmeldrum.
Late on a day which turned from warm and sunny, calm conditions to a very wet afternoon, Henderson posted an eight-under-par 62 to dislodge David Law, the 2011 winner as an amateur, from the lead he had held with a 63. He birdied the long fifth with two putts and holed a four-foot birdie putt – his first single putt of the round – at the eighth.