The 25-year-old left-hander threw a record 52 2/3 innings in the playoffs while allowing just six earned runs for a 1.03 ERA. He struck out 45 batters in his seven appearances, walking only six and giving up 28 hits.
"I feel very humbled," Bumgarner said, acknowledging some of SI's other honorees. "In the game of baseball you get humbled a lot -- but not like this."
The Sportsman of the Year is among the most time-honored and prestigious awards given to athletes.
Fifteen other baseball players (as well as the Boston Red Sox team) have received the honor since its inception in 1954, when Roger Bannister was honored after breaking the four-minute mile in track.
(Photo credit: Taylor Ballantyne/Sports Illustrated)