Answer
unconstitutional, because the game is affiliated with the school.
Step-by-step explanation
Santa Fe School District v. Doe, This was a case that was heard before the united states supreme court. According to the of the establishment of the clause of the First amendment It ruled that a policy permitting student-led, student-initiated prayer at high school football games violating that clause. According to the precedent, Santa Fe School District v. Doe, a teacher who allows a student to lead a prayer at a high school baseball game would most likely be ruled unconstitutional, because the game is affiliated with the school.