On HBO's Real Sports (Monday, 10 p.m.) correspondent Bernard Goldberg reports on Texas high school basketball player Tony Limon, who was sentenced to five years in prison for elbowing an opponent, breaking his nose. More disturbing, Limon alleges (and an assistant coach substantiates) that his coach, Gary Durbon, reacted to the hit by saying, "It's about time someone shed blood."...Home Run Derby is back, back, back—only now it's called Big League Challenge. Beginning on Monday ( ESPN2, 5:30 p.m.) and continuing for the next nine weekdays, 12 top power hitters will slug it out in taped shows. First up: Jose Canseco versus Mike Piazza.