Donald Isidro Merza Dulay (born October 17, 1980, in Los Angeles, California) is a Filipino-American former professional basketball player. He is the current coach of the Nueva Ecija Rice Vanguards franchise of the Maharlika Pilipinas Basketball League (MPBL) and the Pilipinas Super League (PSL). He was an undrafted player but was later signed by Rain or Shine in 2007. He is also given the moniker "Double D" because of the D's in his first name and surname.
Born and raised in Los Angeles, California, Dulay moved to the Philippines to pursue a basketball career. Playing guard at 5âÂÂ8â³, he first starred for Cebuana Lhuillier and Welcoat Dragons in the Philippine Basketball League (PBL) before bringing declaring for the 2006 PBA draft. Although no team drafted him, he was signed by the Welcoat Dragons as a free agent in the 2007âÂÂ08 PBA season. Known in Philippine basketball as âÂÂDouble DâÂÂ, he also played for the Rain or Shine Elasto Painters and the Alaska Aces.
|- | align=left| | align=left| Welcoat | 33 || 13.9 || .321 || .256 || .583 || 1.2 || 2.0 || .3 || .0 || 3.8 |- | align=left| | align=left| Rain or Shine | 40 || 14.7 || .333 || .328 || .656 || 1.4 || 1.6 || .2 || .0 || 4.4 |- | align=left| | align=left| Rain or Shine | 16 || 10.1 || .403 || .350 || .733 || 1.4 || 1.3 || .2 || .0 || 4.7 |- | align=left| | align=left| Alaska | 3 || 5.7 || .000 || .000 || â || .0 || .0 || .0 || .0 || .0 |-class=sortbottom | align=center colspan=2 | Career | 92 || 13.3 || .335 || .305 || .639 || 1.3 || 1.6 || .2 || .0 || 4.1