PALERMO, Sicily (AP) _ Rain forced postponement of Sunday's final of the Sicilian Open tennis tournament.

Top-seeded Sergi Bruguera of Spain is scheduled to meet No. 2 seed Thomas Muster of Austria today for the clay-court title.

The players cruised to the championship match with straight-set semifinal triumphs Saturday. Bruguera defeated countryman Frederic Sanchez 6-1, 6-3. Muster ousted Italy's Andrea Gaudenzi 7-5, 6-0.

Each of the top two seeds, clay specialists, has only dropped one set during the tournament.

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NEW YORK (AP) - Some of Saturday's best baseball action was an auction at Christie's East, where bidders went after memorabilia from Babe Ruth's bat to a baseball from Don Larsen's perfect game.

One of the balls used in Larsen's World Series outing sold for $17,250, said Kirsten Schabacker of Christie's. The New York Yankees right-hander retired all 27 Brooklyn Dodgers he faced on Oct. 8, 1956.

An art deco cornerstone from the original Yankee Stadium, dating to 1922, sold for $17,250. The piece, with the Yankees ''NY'' logo on it, was removed when the ballpark was renovated during the 1970s.

Bidding was still continuing on the auction's main treat, a game-used Ruth bat signed by Yankees teammate Lou Gehrig.

Want a seat to see the Brooklyn Dodgers or the New York Giants? Two buyers did. One paid $3,450 for a double seat from the long-demolished Ebbets Field, while another shelled out $1,175 for a seat from the old Polo Grounds.

A seat from the old Yankee Stadium brought $2,350. The 451 items sold brought in a total $711,321, said Schabacker.

Two big-ticket items were pulled off the block. The bat used by Roberto Clemente to collect his 3,000th hit was not auctioned off - it was expected to bring $15,000; and a rare 1887 advertisement for the first baseball cards did not reach its minimum sale price, said Schabacker.

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LEIPZIG, Germany (AP) - Steffi Graf, the world's top-ranked tennis player, will be operated on Monday for a bone chip in her right foot.

The injury has plagued her for months.

Graf said Sunday that she will miss the Barilla Open in Zurich, Switzerland, where she is the defending champion.

The injury was described as minor. But Graf won't know until after the operation how long she will be unable to play.

The 24-year-old German announced at a press conference after winning the Volkswagen Cup that she felt pain in the foot Friday and was examined by her personal orthopedist, Dr. Hartmuth Krahl.

Graf first began experiencing problems with her foot at the French Open in May.

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BATHURST, Australia (AP) - Larry Perkins and Gregg Hansford took control over the final laps Sunday, and won the Bathurst 1000-kilometer touring car race in a Holden Commodore.

Perkins won Australia's premier touring car event for the fourth time, ending a nine-year drought. Hansford, a former motorcycle racer who was world championship runnerup in the 250cc class in 1978 and 1979, won for the first time in 10 attempts.

Mark Skaife and New Zealander Jim Richards, also driving a Commodore, finished second, 10 seconds behind Perkins and Hansford, after swapping the lead with the winners throughout the day.

Perkins and Hansford were timed in 6 hours, 29 minutes, 6.67 seconds. Skaife and Richards came in at 6:29:17.

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PARIS (AP) - Eric St. Martin took longshot Urban Sea to the lead at the top of the stretch Sunday and held on to prevail over a field of 23 in the 72nd Arc de Triomphe - Europe's most prestigious horse race.

Urban Sea moved into first about a quarter-mile from the finish and edged White Muzzle to win by a neck on a soft track as the favorites faded. Third was Opera House, another half-length back, with Intrepidity coming in fourth.

Urban Sea's winning time for 1 1/2 miles was 2 minutes, 38 seconds. He earned $900,000 from a $1.5 million purse.

Urban Sea, a 4-year-old, is trained by Jean Lesbordes and owned by Hong Kong businessman David Tsui. The horse had won its last two starts at Deauville, France, with American Cash Asmussen aboard, but was listed Sunday at 25-1.

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ST. PAUL, Minn. (AP) - Two-time Olympian Ed Eyestone won the Twin Cities Marathon Sunday and Lisa Weidenbach was the first women's finisher.

Eyestone, of Bountiful, Utah, covered the 26-mile, 385-yard, course from downtown Minneapolis to the Minnesota state Capitol in 2 hours, 14 minutes, 34 seconds - 36 seconds ahead of runner-up John Tuttle of Douglasville, Ga.

Weidenbach, of Gig Harbor, Wash., passed Tatiana Zueva of Russia with one- half mile remaining and raced to an eight-second victory in 2:33:38. Only 25 seconds separated the first three women's finishers.

Both winners from the field of 6,000 received $20,000.

The race was designated by USA Track & Field, the national governing body, as the national men's open championship.

The race also served as the National Masters Championships for men and women. Among the men, Artemio Navarro, 43, of Mexico City, was first in the 40-over age category and ninth overall in 2:17:50. The first Masters woman was Bernardine Portenski, 44, of New Zealand, who clocked 2:41:25 and was sixth overall among the women.

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STAFFORD SPRINGS, Conn. (AP) - Mike Stafanik of Coventry, R.I., won the Fall Final on Sunday, his second victory of the season on the NASCAR Winston Modified Tour.

Stefanik was the class of the field at the 150-lap race at Stafford Motor Speedway. Driving a Pontiac, he led from lap six to 81 when he pitted, but regained the lead following his pit stop on lap 83.

Satch Worley of Rocky Mount, Va., finished second, rallying from fourth place with 25 laps remaining.

Rick Fuller of Auburn, Mass., beat his brother Jeff Fuller, also of Auburn, to the line for third, while George Brunnhoelzl of Lindenhurst, N.Y., rounded out the top five.

Rick Fuller gained several points on Reggie Ruggiero of Berlin, Conn., in his quest for his first NASCAR Winston Modified Tour Championship. Ruggiero was frced to pit for repairs on lap 116 and finished 18th, one lap down.

With two races remaining on the schedule, Fuller leads Ruggiero by 58 points.