Bloomberg: With the biggest boxing match in years coming, the fight to keep it off illegal streaming sites is well under way. HBO, Showtime and the promoters for Manny Pacquiao and Floyd Mayweather have filed a federal lawsuit seeking to shut down two websites that are advertising free streaming videos of Saturday night’s fight. The Mayweather-Pacquiao match will be a major test of the sports media industry’s ability to crack down on piracy. The fight is expected to be the most lucrative boxing match ever — and the most-pirated live sporting event in history.