UPDATE 1-Upper Deck extends Topps tender offer to Aug. 10

(Adds background)

NEW YORK, July 23 (Reuters) - Upper Deck Co. is extending its tender offer for all outstanding shares of baseball trading card company Topps Co Inc TOPP.O until midnight on Friday, August 10, the company said on Monday.

The tender offer was extended as a result of Upper Deck's withdrawal and re-filing on July 19 of notification for the proposed acquisition to the Federal Trade Commission under the Hart-Scott-Rodino Antitrust Improvements Act.

Upper Deck has a 15 day period after the re-filing to answer any questions raised by the FTC. That period will expire on August 3, unless it is terminated or extended, the company said.

Upper Deck launched a hostile tender offer in June to acquire Topps for $10.75 a share, or about $425 million cash.

Earlier this month, Topps said its board recommended that stockholders reject Upper Deck's offer, saying it was not in their best interests.

Topps said it intends to continue discussions with Upper Deck, which publishes sports trading cards and other memorabilia. (Reporting by Jonathan Keehner)