The Miami Dolphins just tweeted that they have traded OT Johnathan Martin to the 49ers. The Dolphins will receive a seventh-round pick from the Niners in 2015 in Martin makes the Niners’ opening-day roster in 2014, according to CBS Sports. In a way, you saw this one coming. The Dolphins wanted to trade Martin. Martin played for Harbaugh at Stanford. The 49ers need a backup tackle.