British Open second round leaderboard

(Reuters) - Second round leaderboard from the British Open at the par-70 Royal Birkdale course, Southport, England on Friday: (U.S. unless stated, (a) denotes amateur)

-1 KJ Choi (South Korea) 18

E Greg Norman (Australia) 18

+1 Camilo Villegas (Colombia) 18

+2 Graeme McDowell (Britain) 18

Rocco Mediate 18

Jim Furyk 18

Robert Allenby (Australia) 18

Alexander Noren (Sweden) 18