"All postseason games, All-Star games and that, will be full-length affairs, and the rule will be so written," Selig said Thursday following an owners' meeting.

Selig said the change also will apply to tiebreaker games that decide division titles and wild-card berths.

"Any game that has significance for the postseason," he said. "It will be very clear now. Everybody will know exactly."

Under baseball's rules, games are official as soon as the trailing team has made 15 outs.