Bart Leininger of Celina won the demolition derby for 1977 and newer cars at the Mercer County Fair on Friday night. Winner of the Figure 8 race was Tony Godwin of Celina. In the Pure Stock class, Jason Markley of Grove Hill won and also took the Best of Show. Another demolition derby, this one for cars from any year, compact cars and a powder puff for women, will be held at 7 p.m. Thursday at the grandstand at the fairgrounds.