(Refiles to fix typo in headline)

(Reuters) - A U.S. judge on Friday ruled that Alphabet's Google must face advertisers' proposed class action lawsuit claiming that it monopolizes the ad exchange market, allowing a case to proceed.

But U.S. District Judge Kevin Castel dismissed some other antitrust claims, including those focused on ad buying tools used by large advertisers.

(This story has been refiled to fix a typo in the headline)

(Reporting By Jon Stempel; editing by Peter Henderson and Leslie Adler)