Seve Ballesteros shot his worst round of the tournament, a two-over-par 74, but won the Million-Dollar Golf Challenge for the third time, by six strokes, and earned one of the sport's richest payoffs, $300,000.

Ballesteros, whose 72-hole total was 279, nine under par, led after each of the four rounds. He made his big move Saturday, when he shot 65. Nick Faldo, closing with a 72, was the runner-up and collected $150,000. Lee Trevino was third and received $105,000. Ray Floyd was fourth, worth $85,000 . . .

In Palm Beach Gardens, Fla., Peter Thomson shot par 72 to win the PGA Seniors Championship and the largest paycheck in his 34-year career, $40,000. Thomson, led after every round and totaled two-under-par 286 on the PGA National course. He was three strokes better than Don January, who closed with 74. January's $25,000 runner-up check wrapped up his third money-winning title in the five-year history of the PGA Senior Tour. He completed this season with a record $328,597 . . .

The dark horse team of Mike Donald and Vicki Alvarez shot 68 to win the $550,000 Mixed Team Classic with 18-under-par 270 in Largo, Fla. The victory was the first for either player and they split the $100,000 first prize. They finished one stroke ahead of Craig Stadler-Lori Garbacz and Curtis Strange-Nancy Lopez.