Kneen took ninth in 2015 , on the Valvoline Racing OW01 Yamaha .
Mercer was on course for a podium in 2013 before slipping off at low speed at Ramsey Hairpin although he came back to take fourth the following year .
Kneen took ninth in 2015 , on the Valvoline Racing OW01 Yamaha , while Mercer was on course for a podium in 2013 before slipping off at low speed at Ramsey Hairpin although he came back to take fourth the following year .