The fifth championship season of Athletes Unlimited softball has arrived and the five-week season roster is set featuring 60 of softball’s best players in the world including Olympians, National Champions and All-Americans. The championship season will showcase 18 newcomers but also bid farewell to a veteran who has impacted the game. Infielder Sam Fischer will take the field for one last ride, concluding the journey she has been on since she first tossed the ball around her backyard at four years old. As one of the first athletes to join AU, the decision to retire came peacefully. “I feel ver…