MANILA, Philippines — Top seed John Mari Altiche and doubles partner No. 2 Alberto Villamor face early challenges in their quest for the men's singles Open title and the honor of becoming the inaugural Mayor Doc Totep Calderon National Tennis champion, taking on Aeyshaun Gomez and Guillani Antonio, respectively, at the Lado Del Rio Resort in Roxas, Isabela on Wednesday, May 29.

Third-ranked John Jeric Accion clashes with Bryan Oliveros, while No. 4 Alexis Santos tests the skills of Kier Manuel in the other featured matches marking the start of the five-day tournament, co-organized by the Palawan Pawnshop National Tennis Championships (PPS NTC) and the Cagayan Valley Tennis Federation (CAVALTEF), aiming to enhance and elevate the tennis program in Cagayan Valley.