g a World Series record.
His batting average for the series is .733 - meaning he records a hit 7.33 times out of every 10
when any batter who averages more than .300 (three hits per 10 at bats) over a season is considered excellent.
Cardinals left fielder Matt Holliday hit a huge solo home run, tying the game at 1-1 in the fourth inning.
But Lester closed the Cardinals down from there, with Red Sox closing pitcher Koji Uehara recording the final four outs.
Lester said: "It doesn't matter how many games at this stage you play, your nerves are going, your heart rate is going.
"It's a matter of realising it's baseball - fastball
down and away - in game five of the World Series, that is just as
effective as 1 February."
The 2013 series has featured a run of tight and tense games between closely-matched sides.
Pitchers have held the upper hand, with scoring opportunities at a premium.
The series returns to Fenway Park on Wednesday for Game
6 - with a possible deciding game seven the following night if St Louis
level the series on Wednesday.