Mundelein's Connor Black celebrates after setting a national record in the 100-yard butterfly of 46.71 in the boys swimming state finals at New Trier High School in Winnetka on Saturday.

JOE LEWNARD | Staff Photographer

Mundelein's Connor Black is on his way to a national record with a time of 46.71 in the 100-yard butterfly in the boys swimming state finals at New Trier High School in Winnetka on Saturday.

JOE LEWNARD | Staff Photographer

Warren's Matt Conway, right, who finished third in the 200-yard freestyle, congratulates champion Reed Malone of New Trier in the boys swimming state finals at New Trier High School in Winnetka on Saturday.

JOE LEWNARD | Staff Photographer

Mundelein's Connor Black leaves the starting block on his way to a national record of 46.71 in the 100-yard butterfly in the boys swimming state finals at New Trier High School in Winnetka on Saturday.

JOE LEWNARD | Staff Photographer

Libertyville's Atticus Rush swims the breaststroke leg of the 200-yard medley relay in the boys swimming state finals at New Trier High School in Winnetka on Saturday.

JOE LEWNARD | Staff Photographer

Mundelein's Connor Black waves from the awards stand after winning the 50-yard freestyle at the boys swimming state finals at New Trier High School in Winnetka on Saturday.

JOE LEWNARD | Staff Photographer

Mundelein's Connor Black smiles on the award stand after setting national of 46.71 in the 100-yard butterfly in the boys swimming state finals at New Trier High School in Winnetka on Saturday.

JOE LEWNARD | Staff Photographer

Libertyville's Alex Snarski celebrates after finishing second in the 100-yard backstroke in the boys swimming state finals at New Trier High School in Winnetka on Saturday.

JOE LEWNARD | Staff Photographer

Libertyville's Alex Snarski swims toward a second-place finish in the 100-yard backstroke in the boys swimming state finals at New Trier High School in Winnetka on Saturday.

JOE LEWNARD | Staff Photographer

Barrington's Brandon Baranowski, top, leaves the starting block during 200-yard medley relay in the boys swimming state finals at New Trier High School in Winnetka on Saturday.

JOE LEWNARD | Staff Photographer