Good question! WNT refuses to make its rules public in a big disservice to fans and players.
No one really knows what the rules are, but the rumor is a player has to participate in at least two big major WNT events a year.
Lukas Fracasso-Verner was recently removed from the WNT rankings of U.S. players eligible for Mosconi Cup after his injury. He only played in one WNT major this year before his accident. That would appear to give credence to the rumors.
Chua was similarly removed from Reyes eligibility. He has played in no WNT majors this year.
If I appear to be pushing Bergman, it's only because I have to work with the thin gruel on which the US Mosconi team derives its meager sustenance! I would not quibble if Thorpe were picked, but his U.S. Open run was his only sparkling performance this year.
The under-25 crop for the U.S. is ultra thin, particularly if minimum WNT participation is taken into account.
Fracasso-Verner (Fargo 767) is the best of the bunch, assuming he comes back from injury. Turns 25 next month.
Twenty-year-old Henderson (Fargo 738) is probably next best, but Nathan Childress (745) has come on strong lately.
Childress, 23, beat Moritz Neuhausen in Arizona, 10-7, for his biggest win ever. He is the only young American to play in every big WNT major this year. Nice game, though nothing jumps out at me. I think he has to get in better shape to help elevate his game.
Payne McBride (Fargo 709, but probably higher now) is the only other American who appeared in enough WNT events to qualify. McBride, 20, never got to the knockout stage of a big WNT event and earned zero points.
Beyond those four, I have the highest hope for 18-year-old Harrison Leinen. He played at all five of the recen WNT events events in the U.S. and showed a ton of game.
I haven't seen much of him, but Landon Hollingsworth (Fargo 740) has been very competitive in WNT events lately.
***
The pickings are even thinner beyond the players listed above. Most top-ranked juniors had ample chance to join part of the WNT's U.S swing, but very few did.
Take Laz Martinez. Fargo 748. One of top youngsters. But he mostly plays money matches. I don't think he has ever played in a WNT event.
Maybe a few more youngsters will emerge from the mists, as Leinen did this summer, but visibility into rising juniors is low.