(Reuters) - Former PGA Championship winner Keegan Bradley converted several crucial putts to grab a share of the first-round lead at the Valspar Championship on Thursday while Jordan Spieth's title defense got off to a horrendous start. Bradley, who had to transition to a non-anchored putter when a ban went into effect this year, mixed five birdies with one bogey for a four-under-par 67 that put him in a three-way tie with Charles Howell III and Ken Duke. 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. More...