Scotland's John McTear and American Alan Tapie share the lead in the Elf Seniors Open at Golf de Chantaco after opening rounds of 64, six under par, with defending champion Brian Waites a further shot off the pace.
McTear, the Cowglen club professional, just 50 and in his rookie season on the circuit, snapped up seven birdies in all.
It swept him to six under par alongside ex-US Tour campaigner Tapie, who was home in 29, as the pair edged one ahead of Waites.
"The best of the birdies came at the last where I hit a seven iron to two feet - I hit every green in regulation but took three from the edge for my only bogey at the short 7th," declared the Scot.
"Having my great pal Jim Gilchrest caddieing for me is a great help - he's a chartered accountant and the brains of the team."
Waites, who broke both legs and arms in an horrific car accident in 1991, is bidding to shatter his own scoring record.
The 59-year-old former Ryder Cup international became the first on the circuit to break 200 for three rounds when winning last year with a 195 total.
"I opened with two 66's and finished with a 63 at Pau so I'm already a stroke up," explained the former Tournament Players Champion.
Waites, who runs his own driving range at Cornwall, collected six birdies, going within two inches at the last.
Ulsterman Eddie Polland, chasing back-to-back successes after his Lawrence Batley Open win a fortnight ago but in pain with a broken toe in his left foot, had only 23 putts for a fighting 68.
Australian Stewart Ginn opened his Seniors Tour campaign with a 69 but Tony Jacklin returned to the action with a 72 to trail eight off the lead.1st Round Scores