Greg Norman&aposs hangover from his remarkable performance at the British Open last week has continued at the senior version of the tournament this week as The Shark shot another over-par round to trail leader Bruce Vaughan by eight strokes at the halfway point of the tournament. Norman improved on his first-round four-over-par effort but finished the second round on one-over to be plus five overall in a share of 20th spot. The 53-year-old Australian&aposs second day was a mixed bag that featured bogeys at the 7th and 8th holes, a double-bogey at the 11th, an eagle at the 16th and a birdie at the 18th. Vaughan is now the outright pacesetter of the tournament on three-under after sharing the lead with Argentinean Eduardo Romero after the first round. The American enjoys a one-stroke lead over compatriot John Cook (two-under) who is outright second while Romero, Bernhard Langer and Tom Watson are all a shot further back on one-under in equal third position. Wayne Grady is tied for 13th spot and is the pick of the Australian contingent on four-over while David Merriman is equal with Norman on five-over. Second Round of the Senior British Open (Par 71): -3: Bruce Vaughan 68 71 -2: John Cook 69 71 -1: Bernhard Langer 70 71, Eduardo Romero 68 73, Tom Watson 70 71 E: Kirk Hanefeld 69 73, Mark McNulty 70 72 +2: Andy Bean 69 75 +3: Luis Carbonetti 72 63, Gary Hallberg 76 69, Tony Johnstone 71 74, Mike Reid 73 72 +4: Ronnie Black 74 72, Philip Blackmar 74 72, Wayne Grady (Australia) 74 72, Ken Green 75 71, Jeff Hall 73 73, Gene Jones 70 76, Constantino Rocca 73 73 Also: +5: David Merriman (Australia) 74 73, Greg Norman (Australia) 75 72 +7: Jim Lapsley (New Zealand) 76 73 +9: Noel Radcliffe (Australia) 76 75 +10: Terry Gale (Australia) 78 74 +11: Bob Charles (New Zealand) 81 72, David Good (Australia) 78 75 +14: Simon Owen (New Zealand) 78 78 +21: Ossie Moore (Australia) 83 80