Phenom Ludvig Aberg takes over top spot at U.S. Open

Ludvig Aberg lines up a putt on the 18th green during the second round of the US Open golf tournament Friday, at Pinehurst No. 2. in Pinehurst, N.C. (Jim Dedmon/USA TODAY Sports)

Ludvig Aberg hits on the 2nd hole during the second round of the U.S. Open golf tournament Friday, at Pinehurst No. 2. in Pinehurst, N.C. (John David Mercer/USA TODAY Sports)

Sweden’s Ludvig Aberg has been the best so far at dealing with the challenging setup at Pinehurst No. 2, but he has completed only half of the task.