To dislodge this key peg propping up Google's search monopoly, some options include ending Google's default deals altogether, which would "limit or prohibit default agreements, preinstallation agreements, and other revenue-sharing arrangements related to search and search-related products, potentially with or without the use of a choice screen."

After Google was found guilty of antitrust abuses, the Justice Department proposed fixes that could hamper Google's chances in the next era of search.

Here is a look at the U.S. antitrust cases that have Google playing defense and that could help shape the company's future. U.S. District Judge James Donato in San Francisco on Monday ordered Google to overhaul parts of its Android app business,