49ers field goal blocked, Jarryd Hayne muffs punt in debut

It’s been a poor start from the special teams unit of the San Francisco 49ers. A 28-yard field goal attempt by Phil Dawson was blocked by Minnesota Vikings safety Andrew Sendejo to waste a 70-yard opening drive by the 49ers. After forcing a three-and-out, Jarryd Hayne muffed a punt from Jeff Locke that was recovered…