Wal-Mart Stores Inc. said it will match rivals’ prices on “Black Friday,” Reuters said. The move ups the ante in the battle to win sales on what is considered to be the kickoff to the U.S. holiday shopping season and a gauge of how overall holiday retail sales will shape up. Wal-Mart is one of the few retailers that will be open on Thanksgiving Day this year, seeking to get an edge over rivals amid what forecasters say will only be modest sales growth this year. Most Wal-Mart stores will be open around the clock on Thursday. Separately, Amazon.com Inc. launched an application today on Apple Inc.’s iPhone that it said allows shoppers to compare prices on a given item in bricks-and-mortar stores with prices on its own website and gives them the option to instantly order the item through Amazon.