American David Oakley emerged as 36-hole leader of the Monte Carlo Invitational, shooting a best of the tournament 65 to be three under par on 135 and making his move from an opening run of four successive birdies.
Meanwhile, former England table tennis international David Creamer holed a birdie putt on the last green for a 66 and second place on 136. Creamer, who topped his opening drive of the tournament 70 yards, built his score on the foundation of a front nine four under par 30.
However, former Ryder Cup captain Bernard Gallacher made an unscheduled departure from Mont Agel. The Scot, in his first season on the European Seniors Tour, was disqualified at the end of the second round after taking what he thought was a correct drop from behind a sign on the 16th. It would have incurred a two-shot penalty.
It led to his eventually signing for an incorrect score of 72. At seven over par he was well out of the leading pack. Gallacher said: "It is disappointing, it's a long way to come for nothing. I thought I was doing the right thing, but these things happen."
The biggest gallery was again following the match featuring Hollywood actor/producer Kevin Costner playing alongside Spain's Manuel Ballesteros. The star of "Tin Cup" shares the lead in the celebrity-am section of the tournament at 13 under par.
Leading 36 hole professional scores (GB & Ire unless stated):
135 D Oakley (US) 70 65
136 D Creamer (Eng) 70 66
137 J Rhodes (Eng) 68 69, B Brask (US) 70 67
138 D Jones (N.Ire) 69 69, J Bruner (US) 69 69
139 T Horton (Eng) 69 70, F Gambetta (US)70 69, T Gale (Aust) 70 69, R Carrasco (US) 70 69
140 E Polland (N.Ire) 62 68
141 B Lendzion (US) 69 72, I Stanley (Aust) 69 72, B Verwey (SA) 71 70, A Bardha (US) 73 68
142 D'Sullivan (Ire) 67 75, K Stevenson (N.Ire) 74 68.