Miller was remarkable in stopping 15 shots in the third period, and Chris Drury and Derek Roy each had a goal an assist in a 3-2 win over Ottawa in Game 4 on Wednesday night.
The Sabres nearly squandered a three-goal advantage but staved off elimination, cutting the Senators' best-of-seven series lead to 3-1 and making Game 5 necessary in Buffalo on Saturday.
It wasn't easy.
The Sabres ended a three-game skid and won for the third time in eight games.
The Senators put a big scare into the Sabres, rallying for two goals in a 1:46 span, cutting Buffalo's lead to 3-2 with 3:19 left in the second period.
Miller, however, stopped 31 shots - the same number he stopped in a 1-0 loss on Monday.
Ottawa enjoyed back-to-back power plays in the third period but failed to get a puck past Miller, despite getting 10 shots on net during a 4:30 stretch.
Miller made a key save when he waved his glove and batted down Joe Corvo's snap shot from the slot.
Ottawa defenseman Wade Redden also had a shot from the slot sail just wide of an open left side.
Peter Schaefer and Dean McAmmond scored for the Senators, who had a six-game winning streak snapped and lost for only the second time in seven home games.
Maxim Afinogenov also scored for Buffalo, the Presidents' Trophy winner in the regular season.