Sprint Nextel (NYSE:S) said it formally filed a request to the Federal Communications Commission to block the pending merger between AT&T (NYSE:T) and T-Mobile USA. Sprint has been the most vocal opponent of the merger, which would combine the second- and fourth-largest wireless carriers in the U.S. Sprint, the No. 3 player, is seen as one of the biggest potential losers from the deal. In its filing, Sprint argued the deal would harm the broadband economy, competition and consumers, echoing arguments the company and Chief Executive Dan Hesse have made over the past few months. -MarketWatch Toyota (NYSE:TM) recalled 106,000 first-generation Prius hybrid cars globally on Wednesday for faulty steering caused by a nut that may come loose. . . . → Read More: Market Updates: Sprint Nextel (NYSE:S), AT&T (NYSE:T), Toyota (NYSE:TM), Microsoft (NASDAQ:MSFT)