Spieth had five bogeys and four birdies through his first 15 holes in Round 2. At 1 under par, he was well off the lead – nine strokes at the time – but comfortably inside the cut line. He then hit two balls out of bounds on the par-5 16th, made a quadruple bogey-9 and fell to 3 over.
He parred his final two holes to shoot 4-over 75 and miss the cut, his second MC in a row, including last week's Players Championship.
Spieth, who said shoring up his puttng is his primary concern, will attempt to defend his title next week at the Dean & DeLuca Invitational.