They led fellow American Chesson Hadley by one stroke, while Spieth fell nine strokes behind as he struggled on greens that he said were among the slowest he had ever encountered on the PGA Tour.
Bradley, who missed four of his last five cuts on the PGA Tour, had no trouble adjusting to the greens during a blustery round at Innisbrook Resort's Copperhead Course in Palm Harbor, Florida, where needed just 25 putts.
"I really had a good day on the greens, which was nice because it’s been awhile," said Bradley, who drained a crucial nine-foot putt for par on his penultimate hole, the par-three eighth, before closing with an up and down for par.
Spieth was returning to the scene of his playoff victory that kicked off one of the game's greatest seasons as he went on to triumph at the Masters, U.S. Open, John Deere Classic and Tour Championship and FedExCup playoffs title.
But the world number one, who started his round on the par-four 10th, was unable to rediscover that form as he bogeyed five of his first seven holes en route to a disappointing five-over-par 76 that left him in a tie for 117th.
The poor round leaves Spieth fighting to make a cut for the second time in his last three starts after missing out at last month's Northern Trust Open.
"It was a very tough day," said Spieth, whose win at the Valspar last year was the first of five on the PGA Tour for the Texan. "I got off to a poor start and I was behind the eight-ball with gusty wind on a tough golf course."
(Reporting by Frank Pingue in Toronto; Editing by Andrew Both)
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