Stallings led the 1914 Boston Braves from last place in mid-July to the National League championship and a World Series sweep of the powerful Philadelphia Athletics – resulted in a nickname he would bear for the rest of his life: "The Miracle Man.

He entered medical school, but was instead offered a contract by Harry Wright, manager of the Philadelphia Phillies.

[3] With Stallings expertly handling a roster of light hitters (Boston hit only .251 as a team) and relying on pitchers Dick Rudolph and Bill James (who each won 26 games), the Braves won 52 of their final 66 contests to overtake the other seven National League teams and finish 10+1⁄2 games in front of the second-place Giants.

[4] They then defeated the heavily favored Philadelphia Athletics in four straight games to earn the nickname "Miracle Braves.

Bill James credits him with being the first major league manager to use platooning as a weapon, rather than to cover a hitter's weaknesses.

The 1914 championship was the only World Series title earned by the Braves during their tenure in Boston, which lasted through March 1953.