Martin's 2015 Isle of Man TT provided mixed results. Opening his account with a retirement in the Superbike Race, he followed this up by taking a respectable 5th place astride the Smiths Triumph in the opening Supersport TT.[33] Switching back to his BMW S1000RR Superstock machine, Martin came home in 7th place in the Superstock TT.[34] Brought in as a late replacement for the injured William Dunlop in the TT Zero Race, and with negligible practice time, Martin took his electrically-powered Victory Racing machine to 4th place in his first participation in the class.[35] He then secured his only podium place of the meeting, again onboard the Smiths Triumph Daytona, when he claimed 3rd place in the second Supersport outing.[36] Martin rounded off his 2015 campaign when he took the factory BMW S1000RR Superbike to 4th place in the Senior TT with an average race speed of 129.602mph, but with a fastest lap average of 132.398mph, a personal best for Martin and just two seconds slower than race winner and outright lap record holder John McGuinness.[37][38]