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Jim Brown's rookie contract sold at auction for more than $21,000.

(SCP Auctions)

CLEVELAND, Ohio - Jim Brown's one-page rookie contract from 1957 sold at auction for $21,228 to an anonymous bidder Sunday morning.

The auction drew nine bidders with a minimum bid of $7,500. SCP Auctions of Laguna Niguel, California, who handled the auction, said only Johnny Unitas' rookie contract, which went for $30,000 in 2007, sold for more than Brown's.

The Cleveland Browns rookie was taken in the first round from Syracuse and would go on to play nine years of professional football. The auction house had predicted the Hall of Famer's contract could sell for $30,000 to $50,000.

Brown's contract was one of more than 1,300 sports-memorabilia items at the auction house's 2015 spring premier that brought in $4.1 million. A pair of Mickey Mantle items accounted for almost half a million of the winning auction bids. Mantle's first Hillerich & Bradsby professional-model bat from an order placed in 1950 sold for $242,209. A game-worn, autographed Mantle 1952 New York Yankees home jersey went for $227,856.

Other top lots and their selling prices:

* Complete 1957 Topps baseball card set: $207,142. The benchmark set of 407 cards is the first to be printed in the standard size still used today.

* John Wooden's circa 1970's UCLA coach's worn jacket: $103,579. The Bruins won the national title that year.

* Game-worn Stan Musial 1963 St. Louis Cardinals complete uniform: $73,408. It was Musial's final season of his 22-year-career.

* Pair of signed 1984 Michael Jordan game-worn Nike Air Shoes from his rookie season: $71,553.

* 1973 Hank Aaron Atlanta Braves game-worn home jersey and '74 pants: $50,061. Aaron broke Babe Ruth's home-run record in 1974.

* 1909-11 T206 Baseball Near Set: $44,427.

* Steve Carlton's 1987 Minnesota Twins World Series 10K Gold Ring: $44,427.

* 1926 New York Yankees team-signed baseball: $41,435. The Yankees lost a seven-game World Series to St. Louis that season.

* Signed 1958 Robin Roberts Philadelphia Phillies game-worn road jersey: $40,388.

* 1970 Al Kaline Detroit Tigers game-worn home jersey: $34,190.

* NFL Hall of Famer Rod Woodson's 2009 NFL Hall of Fame ring: $25,076.