Red Bull Barako / Barako Bull Energy Boosters He was the only draft pick of
Red Bull in the
2007 PBA Draft, and the only draft pick from the 2006
UST Growling Tigers championship team for that year. In 2008, he scored a career-high 18 points in a win over
Barangay Ginebra.
San Miguel Beermen / Petron Blaze Boosters In the offseason, he was signed by the
Petron Blaze Boosters. He helped the Boosters win the
2011 PBA Governors Cup over Talk 'N Text, stopping the latter's attempt for a
Grand Slam.
Shopinas.com Clickers / Air21 Express Duncil began the
2011–12 season as a member of the
Shopinas.com Clickers. He scored 22 points against his former team, but it wasn't enough as they started the
2011–12 Philippine Cup 0–3. He got a new career-high of 23 points against the
Rain or Shine Elasto Painters, but it wasn't enough as they fell to their 13th straight loss, matching the all-time worst start in any conference. They had a better start in the
Commissioner's Cup, starting with two wins in their first four games. He then made six clutch free throws against the
Alaska Aces as they won back-to-back games for the first time that season. That would be his most productive conference in the PBA, as he started all nine games for them and averaged 9.9 points, 3.1 rebounds, and 1.4 assists.
2nd stint with San Miguel Two games into the
Governors' Cup, Duncil got traded back to the Boosters in exchange for
Wynne Arboleda.
3rd stint with San Miguel As a free agent, Duncil signed with San Miguel for the
2013–14 season.
GlobalPort Batang Pier A free agent once again, Duncil joined the
GlobalPort Batang Pier.
Quezon City Capitals After his stint with GlobalPort, Duncil returned home to Pampanga and set up a trucking business. He didn't play professional basketball for four years until he got the call to play for the
Quezon City Capitals. To get into playing shape, he had to lose 40 pounds. He helped them get their first win of the season by leading them with 14 points against
GenSan Warriors. Against the
Valenzuela Classic, he scored 25 points for their second win.
Mandaluyong El Tigre From the dispersal draft held that year, the
Mandaluyong El Tigre were able to select Duncil. He was only able to play one game for them before he became a free agent once again.
Navotas Clutch The
Navotas Clutch then signed Duncil. ==Player profile==