The small one-point spread between the 1st and 3rd place corps at the 2017 Drum Corps International World Championship Prelims in Indianapolis grew to 1.525 points in the Semifinals. The 0.363 spread between the top two corps grew slightly to 0.413. The order remained the same, with Blue Devils maintaining the corps' perfect season, and Santa Clara Vanguard still in the run for the title.

While the spread between Vanguard and Carolina Crown increased from 0.637 in Prelims to 1.375 in Semifinals, the spread between Carolina Crown and 4th place Bluecoats decreased from 1.725 points to 1.375. There were no placement changes among the top 13 corps.

View the complete World Championship Prelims recap of scores.

Blue Devils
(1st-98.113) won Total General Effect as well as Total Visual, despite placing 2nd in Proficiency and Color Guard to Santa Clara Vanguard. Each of those spreads was 0.20, but it was the 0.70 advantage the Devils had over Vanguard in Visual Analysis (in which SCV placed 3rd) that tipped the scales in Total Visual. All three Music captions placed 2nd by very close margins to the respective 1st place lines, which were Carolina Crown in Brass and Analysis and SCV in Percussion.

Santa Clara Vanguard (2nd-97.700) was 2nd in Total General Effect by 0.20, 1st in Total Visual by winning Proficiency and Color Guard, and 3rd in Total Music after placing 3rd in the two captions other than Percussion. Carolina Crown (3rd-96.588) was 3rd in Total General Effect, 3rd in Total Visual — despite placing 4th in Proficiency and 5th in Color Guard — and 2nd in Total Music by placing 1st in Brass and Analysis and 4th in Percussion.

Bluecoats (4th-95.203) finished 4th in Total General Effect, 5th in Total Visual due to placing 3rd in Proficiency, 5th in Analysis, and 6th in Color Guard, and 5th in Total Music due to placing 4th in Brass and Analysis and 5th in Percussion. The Cavaliers (5th-94.925) captured 3rd in Percussion, but 5th in the other two Music captions, 5th in Total General Effect, and 4th in Total Visual by taking 4th in Analysis and Color Guard, which lifted the corps' 5th-place finish in Proficiency.

Boston Crusaders (6th-93.400) placed 3rd in Color Guard, just as in Prelims. The only other caption that didn't place in 6th was a 7th-place finish in Visual Analysis. The Cadets (7th-91.738) were slightly hurt by a 9th place finish in Brass, just as in Prelims. General Effect fell from 6th to 7th while the three Visual captions averaged out to 7th, as did the three Music captions.

Blue Knights (8th-91.013) was 8th in Total General Effect, Total Visual, and Total Music, with caption finishes between 7th in Brass and Music Analysis and 10th in Color Guard. Phantom Regiment (9th-89.888) was 8th in Brass, 9th in Percussion, 11th in Visual Proficiency and Music Analysis, and 9th in everything else.

Blue Stars (10th-88.975) opened up its spread over Crossmen by placing 7th in Color Guard and between 9th and 11th in all other captions. Crossmen (11th-88.488) was 9th in Music Analysis and 10th or 11th in everything else. Madison Scouts (12th-86.475) will return to the Finals after placing 13th in Visual Proficiency, 14th in Visual Analysis, and 12th in the remaining captions.

Mandarins (13th-85.550) was 13th in Color Guard (under Madison) but 12th in the other two Visual captions (over Madison). All other captions placed 13th or 14th. The Academy (14th-84.188) traded placements with Colts from the Prelims by placing 16th in Percussion, 13th in the other two Music captions, and 14th or 15th in all other captions.

Colts (15th-83.888) finished 13th in Color Guard and 14th through 16th in the remaining captions. The corps fell to The Academy due to rather small deficits in a few captions, but nothing glaring. Vanguard Cadets (16th-81.975) was 18th in Brass and 19th in Percussion, but 15th or 16th in the remaining captions.

Troopers (17th-81.275) was 15th in Percussion, but 21st in Color Guard. All other captions placed 17th or 18th. Spirit of Atlanta (18th-80.075) was 16th in Brass, 17th in Color Guard, and 18th through 20th in the remaining captions. Blue Devils B (19th-80.050) was 17th in Visual Analysis, 18th in Total General Effect and Visual Proficiency, and 19th or 20th in everything else.

Oregon Crusaders (20th-79.050) took 18th in Color Guard, 21st in Visual Analysis, and 19th or 20th in the other captions. Pacific Crest (21st-78.000) was 20th through 22nd in all captions. Legends (22nd-76.225) was 20th in Color Guard, tied Genesis for 22nd in Total General Effect, placed 22nd in Percussion, and 23rd in the remaining captions.

Genesis (23rd-76.213) was 21st in Brass and 22nd or 23rd in all else. Music City (24th-74.275) was 24th or 25th in all captions. Spartans (25th-73.475) was 22nd in Visual Analysis and 24th or 25th in everything else.