What penalty will a golfer incur after hitting a golfer 's ball during a putt ?
* 19-4 – A ball deflected by a fellow competitor or their caddy in stroke play is governed by rule 1-2 ( generally a two - stroke penalty for the competitor ) * 19-5 – A player 's ball in motion which strikes another ball at rest must be played as it lies without penalty , unless both balls are on the putting green in which case the player incurs a two - stroke penalty .