I managed to play a wrong ball yesterday morning in a Seniors Medal. On the 2nd tee I took out a new ball and added my usual markings to it with a felt tip marker (always use an old ball on the 1st due to a large water hazard on the right and Gorse bushes all down the left hand side). Hooked my drive into the left semi-rough. Walked to where I expected my ball to be, found a ball and hit a superb 4 hybrid to the heart of the green. At this point a gent appeared over the bank which separates the 1st and 2nd fairways and asked if anyone had seen his ball. Then I realised there was another ball lying about 10 yards further on and it was mine. Instant 2 shot penalty! I showed the other player where to place a substitute ball and then played another pretty good shot into the green with my ball using a 5 hybrid this time and 2 putted from the fringe. Really a 4, but a 6 had to go on my card! Felt like a right pillock for not checking the ball. BTW I wasn't the only one: there were a number of wrong ball incidents in this comp, including a guy who would have come 3rd and won a voucher if he hadn't incurred a 2 shot penalty. Shows you can't be too careful. 