Mervin Santiago and Jethro Ramos head the big roster of Filipino bidders girding for another test of power and endurance with the foreign aces out to extend their control of the Century Tuna full IRONMAN Philippines, which unveils its third edition this Sunday in Subic Bay.

Santiago, who placed fourth in last year's staging of the exacting 3.8-kilometer swim, 180-km bike and 42-km run race, and Ramos, winner of 2022 Penong's 5150 Davao, will be among the 202 local triathletes chasing the overall championship and seeking an end to the visiting bets' reign at the country's top triathlon destination.

Seychelle's Nick Baldwin topped the inaugural full IRONMAN Philippines in 2018 before Petr Lukosz prevailed over Thomas Nteliopolous of Greece and Filipino Luigi Robles in stifling conditions when the sport's flagship event was held in post-pandemic last year.

Elmer Santiago, the better half of the country's power couple, the other being women's full IM champ Ines, and duathlon king Edgar Puruganan are also set to duke it out, not only for the coveted overall plum but also for spots in two IRONMAN World Championships.

Fifty slots will be staked for the IM world meet in Nice, France in September and another 25 seats will be up for grabs in the Kona, Hawaii championship in October, according to the organizing The IRONMAN Group/Sunrise Events Inc.

The 41-year-old Negrense has already clinched a berth in the World Championship after topping the IRONMAN 70.3 in Cebu last year.

Other locals clashing for top overall honors and age-group titles are John Nino Monte, Pol Buencamino, Paolo Leaño, Rene Tayag, Lean Soto, Ramil Ranario, Gabriel Peña, Reuven Alzaga, Ralph Lagrisola, Jemuel Clemente, John Carlo Baguyo, John Raymund Ramos, John Lester David and Eric Juban, among others.

Evangeline Endaya, meanwhile, targets the top podium finish in the women's side of the race sponsored by Century Pacific Food Inc. through its top brand Century Tuna, in the absence of compatriot and last year's winner Ines Santiago, who has opted to compete in the Subic 70.3 triathlon.

The 41-year-old Negrense has already clinched a berth in the World Championship after topping the IRONMAN 70.3 in Cebu last year.