Toro Rosso rookie Brendon Hartley says he will focus exclusively on his Formula 1 commitments this year, excluding any one-off races in any other category. Hartley has retained his ties with Porsche, for which the Kiwi won last year's world endurance championship, but the 28-year-old's priority is to build a new career in F1. "I will still have an association with Porsche but I won't be doing any races other than Formula 1, which I think is the sensible thing for me to do because I need to be fully focused," he told the NZ Herald. Globetrotter Hartley's grueling schedule helped by maturity "I am going to spend all my energy and time on being fit enough, going into the races...
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