Holcomb's James Vance and Van Buren's Tyler Griffin fight for a ball on the floor.
Massey calculated 30 of the Hornets' 62 points to help sixth-seeded Holcomb cruise to a 65-42 win against No. 11 seeded Van Buren.
"Their size wasn't equivalent to ours," Holcomb coach Seth McBroom said. "Massey is an excellent post player and did a great job of post discipline. He's a load in there and hard to move around. He kind of had his way at times. He's a heck of a player. There is no doubt about that."
Holcomb scored the majority of its points in transition when it wasn't finding Massey. Cameron Clark led all Holcomb guards with 15 points.
"We had some guys step up in our transition game," McBroom said. "Cameron Clark got our transition game going a little bit. Tyler Lewis came in and helped handle the ball and helped our defense. You can also never take for granted what Michael Glover and James Vance do for our defense and also in the rebounding department."
Holcomb limited Van Buren to six points in the first nine minutes of the game. The Hornets led 24-6 with seven minutes left in the first half.
"We just tried to play well defensively and keep them in front of us," McBroom said. "That's kind of our whole philosophy. We wanted to make it tough for them to score. They got down deep on us a couple of times and got a couple of rebounds. They beat us on the boards at times, but overall we kept them in front of us. I think that was the key.
"We clicked a little bit better tonight than we had earlier in the year," McBroom added.
Van Buren cut the deficit to 26-14 with 3:51 left in the first half, but never got closer.
"They threw that press on us and it took us a couple of possessions to adjust," McBroom said of the second quarter. "We probably should have been more aggressive attacking it, but it was a good adjustment by their coach to try something different. We finally got our guys set up and attacked it better in the second quarter and in the second half."
Holcomb's largest lead in the second half was 57-28 in the third quarter.
Austin Chilton led Van Buren in scoring with 13 points.
Holcomb will play third-seeded Hayti in the quarterfinals Friday at 7 p.m. Hayti defeated Holcomb by single digits in December.
"They are a heck of a team and probably playing about as well, if not better, than any team coming into the tournament," McBroom said of the matchup against Class 2 district rival Hayti. .
No. 6 Holcomb 65, No. 11 Van Buren 42
VBS 6 11 11 14 - 42
HHS 19 15 23 8 - 65
VAN BUREN (42) - Austin Chilton 13, Shaun Burtschi 2, Dusty Parsons 16, Tyler Griffin 9, Alex Golaszewski 2. FG 14, FT 14/20, F 13. (3-pointers: none. Fouled out: none)
HOLCOMB (65) - Chase Davis 6, Tyler Lewis 5, Cameron Clark 15, Ryan Reeves 7, Jamie Massey 30, Michael Glover 2. FG 29, FT 6/11, F 16. (3-pointers: Reeves 1. Fouled out: none)