Seve Ballesteros dropped a 30-foot birdie putt on the 17th hole to take a one-stroke lead midway through golf's richest tournament, the Million Dollar Challenge, being played in Sun City, Bophuthatswana.

Ballesteros' one-under-par 71 put him at 138, a stroke ahead of Craig Stadler in the 10-man field. Lanny Wadkins was in a tie for third with Jerry Pate and defending champion Johnny Miller at 140. Ray Floyd and Jack Nicklaus were at three under for the two rounds, Greg Norman was a shot further back, Lee Trevino was at even par, and Gary Player was at two over . . .

European Open champ Manuel Pinero shot a course record six-under-par 65 for a 137 total to take the individual lead by two strokes and give Spain an eight-shot team lead midway through the 29th World Cup in Acapulco. Baldovino Dassu of Italy was next at 139 and Bernard Gallagher and Dan Halldorson of Canada were at 140 . . .

Arnold Palmer and Howie Johnson birdied their last holes on the PGA National course in Palm Beach Gardens, Fla., to share the second-round lead in the $150,000 PGA Seniors Championship at three-under-par 141.