After his much-publicised driver issues, Rory McIlroy admits he's having a few teething problems with his new big dog, problems he'll need to iron out for the US Open.

McIlroy was not happy that details of his non-conforming driver at the PGA Championship were leaked during the event at Quail Hollow.

McIlroy then made the move back into the TaylorMade Qi35 driver ahead of this week's RBC Canadian Open - after previously using the Qi10 driver for his now infamous failed USGA test. You may like

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The new Grand Slam winner has been testing the Qi

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