11 GS, 5-5, 0.97 ERA, 101.2 IP, 10 CG (4 SHO)
If you read that stat line correctly, yes, Christy Mathewson went the distance in 10 out of 11 total starts in his postseason career.
That stretch of dominance commenced in 1905, where the Hall Of Fame right-hander pitched in Game 1, 3, and 5 of the World Series and did not, by any means, disappoint.
In those three starts, Mathewson threw three complete game shutouts while yielding just one walk in 27 innings of work in just five days. It would be his only World Series title, but his stellar postseason play didn’t stop.
Mathewson would go on to maintain a 1.33 ERA over his final eight starts and while he was only a winner in two of them (11 unearned runs were scored off him) he set — and still owns — the major league playoff record for complete games and shutouts.