McIlroy 'concerned' for US Open after driver issues

Rory McIlroy "concerned" about form heading into US Open after driver issues at Canadian Open lead to a missed cut and struggles. McIlroy used a new 44-inch driver in Toronto, but only hit 13 of 28 fairways and posted a high second-round score. With the US Open approaching, McIlroy is worried about his tee shots and aims to improve his driving accuracy before the tournament at Oakmont.