Dallas teenager Jordan Spieth got with three shots of the lead but stumbled down the stretch at the HP Byron Nelson Championship.
Greens were pelted by big hail and debris blew around the TPC Four Seasons course, but the site of this week's Byron Nelson Championship escaped significant damage during heavy storms.
Jason Day, 22, survived the final hole of the Byron Nelson despite hitting into the water.
Dallas teen Jordan Spieth finished among the top 20 at the HP Byron Nelson.
Golf's older guard makes a run at HP Byron Nelson Championship.
Dallas amateur Spieth shoots best round yet at HP Byron Nelson Championship, stays in contention.
Jason Day overcame a sinus infection to share the ead the HP Byron Nelson Championship on Thursday.