A trainer tee and guide assembly that creates a target zone leading a bat swung by a player toward a ball placed at a fixed elevated position above ground. The acceptance angle of the target zone is adjustable to accommodate different angles of swing as the player gains greater skill in the course of training. The assembly includes a U-shaped frame having upper and lower horizontal branches whose free ends terminate in vertically-separated blocks between which the ball is placed, the frame being raised to place the ball at a level appropriate to the height of the player. Pivoted on the blocks are upper and lower guide arms which extend laterally to the left or right of the blocks to define a target zone whose angle of acceptance depends on the angular orientation of the arms. The arms are angularly adjustable to vary the acceptance angle in a range going from a low skill angle in which the arms diverge in opposite directions about 45 degrees from the horizontal to accommodate large angle swings of the bat, to a high skill angle in which the arms are nearly parallel to each other to accommodate a level swing of the bat affording maximum power.