Box Billiards Mixed Doubles Open

Results

Recap

Published July 7, 2026

Pool's power couple delivered a commanding performance in Vietnam, as Joshua and Pia Filler claimed the 2025 Box Billiards Mixed Doubles Open title under the Pro Billiard Series banner. The German duo — ranked among the sport's elite individually — proved just as formidable as a team, defeating Chou Chieh-Yu and Ko Ping-Chung in the final to take the championship.

The result adds another significant title to both players' growing résumés. Joshua Filler, a two-time WPA World Champion in Nine-ball (2018) and Eight-ball (2024), is currently one of the most decorated active players on the international circuit. His wife Pia, who turned professional in 2020, has assembled an impressive collection of titles in her own right — including multiple European Pool Championship golds and Euro Tour victories — and is listed by Wikipedia as holding a WPA ranking of No. 4 in women's 9-Ball.

The runner-up pairing of Chou Chieh-Yu and Ko Ping-Chung made the final a compelling matchup. Ko is himself a former WPA World Ten-ball Champion with deep experience at the highest levels of the game, having defeated Joshua Filler 10–7 in the 2019 WPA World Ten-ball Championship final according to Wikipedia. That history gave the final an added layer of competitive context, with Filler and his partner ultimately turning the tables in the team format.

The mixed doubles discipline continues to gain traction within the Pro Billiard Series calendar, offering a format that blends the tactical demands of standard tournament pool with the strategic dimension of partner play. Vietnam served as the backdrop for this edition, extending the PBS's reach across Southeast Asia — a region that has become an increasingly prominent stop on the global cue sports tour.

For the Fillers, the win in Vietnam represents yet another entry in what has become a remarkable run of combined success. Pia's title list, per her Wikipedia profile, now includes this Mixed Doubles Open alongside her 2025 European Pool Championship victories in both 9-Ball and Straight Pool — a remarkable haul within a single calendar year. Joshua, meanwhile, continues to compete and collect titles across multiple formats and tours. Whether as individuals or as a team, the Fillers remain a formidable force on the international pool stage.

Sources: Pia Filler – Wikipedia, Joshua Filler – Wikipedia, Pro Billiard Series – WPA Pool

This recap was compiled from public tournament records and tournament organizer communications. ForceFollow is not affiliated with the tournament organizer.