Jason Day nearly dropped out of the Byron Nelson Championship before it began. He wound up winning the tournament - even though most folks likely will remember Jordan Spieth as the big winner.

Day fought through a rocky final round for a 2-over 72, but it was good enough to give the 22-year-old Australian the first win of his PGA Tour career.

Still, the 2010 Nelson will go down for the remarkable Tour debut by Spieth, a 16-year-old junior at a local Dallas-area high school.

Spieth was within three shots of the lead on the final nine holes, but dropped back into a tie for 16th. He shot a 2-over 72 in the final round, his highest score of the tournament. His 4-under 276 was six strokes behind Day.

The maturity and moxie Spieth showed was a surprise for someone who spent last week playing in the state high school tournament.

Day isn't exactly an old-timer himself. When he was 19, he won a Nationwide Tour event, making him the youngest winner of a PGA Tour-sanctioned tournament.

Day has been battling health problems all season, but he got a new diagnosis and a new batch of medicines Monday. The drugs left him so queasy Thursday morning that when he went to get an umbrella from his car, he thought about driving to his home in Fort Worth.

In another tournament:

* Sun Young Yoo won the Sybase Match Play Championship, in Gladstone, N.J., for her first LPGA Tour victory, beating Angela Stanford 3 and 1 yesterday at Hamilton Farm.

Yoo, from South Korean, is the LPGA Tour's eighth straight foreign winner and 25th in the last 26 events.