While some smaller colleges or those with less competitive athletic programs *might* consider a 17 ACT score, it will severely limit the applicant's options and likely won't be enough to be competitive against other applicants with higher academic scores and athletic abilities. The emphasis on academics varies by school and sport, but a higher ACT score almost always increases the applicant's chances.
Focus on improving the ACT score should be a priority for anyone aiming for an athletic scholarship.