Players will be sent off both tees in twosomes .
The final group may only get one or two holes of the fourth round in before darkness halts play , which the USGA expects to happen around 8 p.m.
Players will be sent off both tees in twosomes , but the final group may only get one or two holes of the fourth round in before darkness halts play , which the USGA expects to happen around 8 p.m.