Houston's Mark White has upset the seedings at this year's United States National Snooker Championship at Q Ball Snooker & Pool in his home city, as he wins Group D undefeated to secure his round of 16 berth.

This is White's second appearance in this Championship since becoming a U.S. citizen, though he is determined to improve on his 2017 performance at the New York Athletic Club when he suffered a very disappointing round of 16 exit.

Earlier this year he made the semifinals of the Pan American Snooker Championship where he was defeated by the eventual champion, Brazil's Igor Figueiredo, so his Group victory did not come as too much of a surprise. White will now face the fourth placed player in Group A, Amit Karki.

The number four seed in Group D, Laszlo Kovacs, did finish in second place with just that one defeat to White, and so also advances into the round of 16 where he will take on Arif Mahmood who finished third in Group A.

The defending Champion, Ahmed Aly Elsayed, has advanced into the round of 16 after topping Group A, but the number one seed did not have it all his own way. The four-times champion won his first three Group matches without losing a frame, however he then lost his final match to Washington state's Cheang Ciing Yoo who has qualified in second place.

Aly has booked an encounter with the fourth placed player in Group D, Rushil Vig, while Yoo goes onto meet Thomas Tan who came third in Group D.

New York's Raymond Fung was in fine form in Group B as the number two seed sealed top position after a clean sweep of victories, and now in the round of 16 the 2017 Champion will take on the fourth placed player in Group C, Syed Hassan.

Second place in Group B was gained by Nitin Mehta, and he will match up in the round of 16 against the third place player in Group C, Vaishal Talati.

The twice former champion Ajeya Prabhakar comfortably won Group C undefeated, with the number three seed now taking on the fourth placed player from Group B in the round of 16, Majid Randhawa.

Steven Wong has progressed from Group C in second place, and now the Californian will compete against Michael Monegato, as the player from Illinois advanced into the round of 16 by finishing third in Group B.

The round of 16 draw as follows:

Round of 16 (Best-of-5 frames)
Match ID	Player		Player
R16-1	Ahmed Aly Elsayed (New York) 1	vs.	Rushil Vig (California)
R16-2	Steven Wong (California)	vs.	Michael Monegato (Illinois)
R16-3	Mark White (Texas)	vs.	Amit Karki (California)
R16-4	Nitin Mehta (California)	vs.	Vaishal Talati (Illinois)
R16-5	Raymond Fung (New York) 2	vs.	Syed Hassan (Texas)
R16-6	Laszlo Kovacs (New York) 4	vs.	Arif Mahmood (Illinois)
R16-7	Ajeya Prabhakar (California) 3	vs.	Majid Randhawa (Louisiana)
R16-8	Cheang Ciing Yoo (Washington)	vs.	Thomas Tan (Illinois)

All round of 16 ties will be contested over the best-of-5 frames, with matches R16-1, R16-2, R16-3 & R16-4 commencing at 11am local time (9am Pacific Time), and the remaining matches getting underway at 2pm local time (12pm Pacific Time).

The winner of the Championship on Labor Day Monday evening will be crowned the 2019 United States National Snooker Champion, and alongside the runner-up will gain automatic selection to represent the United States in the following year's international snooker competition.