Marquez knocks out Pacquiao in the 5th. Literally -- Pacquiao was unconscious for like a minute. He leaned in to throw a punch just as Marquez was loading up and sending a big right, so it doubled up the force of it. From one angle it really looked like he ran into his fist.
Marquez knocked Pac down in the 3rd, Pac knocked him down (sort of, more of a stumble) in the fourth. Exciting fight, too bad it didn't go on a bit longer.