BRIEFLY : MUSTER'S WIN STREAK ON CLAY ENDS.

Thomas Muster's clay-court winning streak ended at 38 matches, and Boris Becker's futility on that surface continued when both lost in the semifinals Saturday at the BMW Open in Munich.

Carlos Moya, a 19-year-old from Spain, needed just 69 minutes to beat Muster 6-3, 6-3. That snapped a winning streak that dated back to early August. Slava Dosedel of the Czech Republic, another unseeded player, beat local hero Becker 7-6 (7-2), 2-6, 7-6 (8-6) in a three-hour match.

Two-time defending champion and top seed Michael Chang fell victim to flashy, hard-serving Moroccan Karim Alami 6-4, 6-4 in the semifinals of the $328,000 AT&T Challenge in Atlanta.

Alami, the sixth seed, advanced to his first final of the year and second of his career. For Chang, who won in Atlanta in 1994 and 1995, the loss was a poor start to his clay-court season. Following a second-round loss at Monte Carlo last week and the loss in Atlanta, he plans to take a few days off next week to nurse an injured right shoulder.

Conchita Martinez routed a flu-weakened Mary Pierce 6-1, 6-1 to reach the finals of the Rexona Cup in Hamburg and a meeting with fellow Spaniard Arantxa Sanchez Vicaro.

SOFTBALL

Lisa Fernandez homered and Lorie Harrigan threw a one-hitter as the U.S. Olympic softball team beat Southern California Select 3-0 to sweep an exhibition doubleheader in Lakewood.

Leah O'Brien's base hit in the bottom of the eighth inning scored Dionna Harris to give the Olympic team a 1-0 victory in the opener.

It was the second stop of a 21-city pre-Summer Games tour for the Olympians.

In the opener, Michele Smith (2-0) went the distance, allowing two hits en route to her second shutout of the tour. Kristine Carr (0-1) took the loss, yielding seven hits and the game-winning run.

In the second game, Fernandez led off the third with a home run to center field and Dot Richardson and O'Brien added run-scoring singles in support of Harrigan (2-0). Amy Stewart (1-1) gave up three runs and seven hits for Southern California Select.

GOLF

Larry Gilbert and Graham Marsh shared the top spot at the PaineWebber Invitational in Charlotee, N.C., but the biggest stir was caused by the presence of Arnold Palmer on the leaderboard.

Of the 15 players within four shots of the co-leaders, nobody was more conspicuous than Palmer, who is 66. Followed as usual by the largest gallery on the course, Palmer rewarded Arnie's Army with a second consecutive 70, leaving him three back heading into today's final round of the $800,000 Senior PGA Tour event.

Palmer, who helped design the 6,774-yard Piper Glen layout, hasn't finished better than 34th in any tournament in the last two years, and he hasn't won since the now-defunct Crestar Classic in 1988 near Richmond, Va.

Jeff Maggert, playing on his home turf at the Tournament Players Course at The Woodlands, Tex., shot a 6-under-par 66 to claim a one-shot lead over David Duval after three rounds of the Shell Houston Open.

Maggert, who had seven birdies, suffered his only bogey at No. 18 when he chipped past the hole and missed a 10-footer for par. That gave him a 14-under 202 after three rounds.

Catrin Nilsmark knocked Val Skinner out of the lead at the Sprint Titleholders Championship, shooting a 4-under-par 68 in Daytona Beach, Fla., and setting up a tight race for the richest purse on the LPGA Tour.

The tall Swede holed a 68-yard sand wedge for eagle on the par-5 ninth and birdied the other par-5s, including a 6-footer on No. 18, for a 13-under 203 total and a one-stroke lead over Skinner.

MOTOR SPORTS

Ron Hornaday Jr. of Palmdale outraced hometown favorite Mike Bliss following a late caution period to win the $255,175 NASCAR Craftsman Truck Series Craftsman 200 at Portland Speedway in Oregon.

Hornaday, who started 11th, wasted little time putting his Chevrolet pickup truck into the lead, and held a lead of more than a second over Bliss's Ford when the last of seven caution flags waved with 13 of 200 laps remaining.

Bliss, a former USAC Silver Crown champion, restarted on Hornaday's rear bumper but was unable to reel in the leader. Hornaday had a 0.664-second cushion at the finish, winning for the seventh time in the series.

Doug McCoun edged early leader Craig Raudman to win the NASCAR Featherlight Southwest Tour Pennzoil 200 at Sears Point Raceway in Sonoma.

McCoun's win was tarnished when NASCAR officials determined after the race that the engine in his Pontiac Grand Prix was slightly oversized. He was given the win, but received last-place NASCAR points for the event and was fined.

McCoun, who pitted only once during the 50-lap race for new back tires, finished .2 seconds ahead of Raudman with an average speed of 66.471 mph.

COLLEGE FOOTBALL

Notre Dame quarterback Tom Krug's brief football career has been cut short by a potentially dangerous neck condition. Krug's condition was discovered after he sprained his neck during an intrasquad scrimmage on April 20. X-rays taken three days later showed no serious problems from the scrimmage injury but did show a multiple fused vertebrae in Krug's neck. He was held out of the April 27 scrimmage, and a CT scan confirmed the diagnosis.

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PHOTO Carlos Moya - He ended Thomas Muster's 38-match winn ing streak on clay with a 6-3, 6-3 victory.