Enriquez withstood the attacks of Ateneos Karym Laidan to win by superiority after they had battled to a 3-3 tie.
Enriquez will face former national jin Angelito Ong, who came back from a 1-3 deficit to nip Baguios Michael Albert Belo in one of the exciting matches in the week-long tourney organized by img and Philippine Taekwondo Association, sponsored by Samsung and supported by Accel and 103.5 K Lite.
The other pinweight semifinalists were Baguios Edward Buliyat, who blasted TBBs Witt Valencia, 3-0, and USTs Terrence Boteja, who toppled TUPs Mirzam Madid, 3-0.
John-John Abratique, 1998 Asian Games fly bronze medalist, Kuala Lumpur SEA Games and 2001 World Cup bronze winner Dax Morfe and two other national pool members fly Anthony Ong and bantam Arnold Valenzuela and former RP jin Ronald Samijon also triumphed to gain quarterfinal slots.