Having endured more than his fair share of frustration and bad luck, Jason Kubler could not be blamed for having wanted to throw in the towel at various stages of his professional career.
Multiple knee operations curtailed Kubler's progress after he graduated from the junior ranks, and at times he was forced to work as a tennis coach to survive financially.
But perseverance has always been one of Kubler's strengths and there were few more deserving winners on day one at the Australian Open after the 29-year-old reached the second round for the first time at Melbourne Park.
