Olympic champions Michael Phelps (Best Male Athlete) and Shawn Johnson (Best Breakthrough Athlete) are up for trophies at the 17th annual tribute to the standouts in sports. Samuel L. Jackson hosts in L.A. (ESPN, 9 P.M.)

Miley Cyrus (Hannah Montana) and Selena Gomez (Wizards of Waverly Place) unite in a crossover tale that threads through their sitcoms — plus The Suite Life on Deck. They all meet on a cruise! (Disney, 8 P.M.)

Harry Potter fans, rejoice! Elizabeth Vargas hosts this fascinating look at the single mom (and ex-janitor!) who conjured up the iconic novels. (The latest flick arrives July 15.) Included: a trek to Rowling’s Scotland hometown. (ABC, 8 P.M.)