We've kicked around the issues that come with the WPA World rankings before on the forum, and yes, they don't give a clear picture of who is the best. Like other ranking systems, they are skewed in favor of those who participate the most. This issue is not specific to pro pool. Some will recall that late in Serena Williams' career, when she had greatly cut down on the number of events played, though still just about as good as anyone, her ranking plummeted.
Nonetheless, Pia Filler is #1 in many respects. She conducts herself very professionally and with good sportsmanship and is an enduring credit to pro pool. Her Fargo puts her in the World Top 25 among women, and there is no disputing that she deserves to be counted in that elite category.
She has had a steady climb in the women's game over the past couple few years and even had a top 10 finish in the Derby City 9ball in 2025.
Go get 'em, Pia.