Fans attending the game at Angels Stadium in Anaheim, Calif., were given blankets featuring the name and number of Hideki Matsui, a designated hitter recently acquired from the New York Yankees.
Team officials said a Guinness World Records adjudicator would be on hand for the moment during the game when fans were instructed to don the blankets to determine whether the previous record -- set March 5 at a Cleveland Cavaliers basketball game, when 17,758 people wore fleece blankets -- had been broken.
"Setting this world record will be a unique and memorable experience for our fans, the first of many in 2010," Angels spokesman Tim Mead said.
Officials estimated more than 30,000 Angels fans put on the blankets.
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