A replay review was needed to confirm Hayato Sakamoto had actually led off the first inning with a home run.
The bombs hit by Alex Ramirez, Michihiro Ogasawara and Edgar Gonzalez left nothing to chance.
The Yomiuri Giants quartet homered, starter Satoshi Fukuda survived a shaky outing, and the Giants' bullpen helped put away the Yokohama BayStars in a 5-2 victory on Saturday at Tokyo Dome.