Rory McIlroy of Northern Ireland tees off at the WGC-HSBC Champions in Shanghai. Photo: AFP

Rory McIlroy must strive harder to be the greatest, says 18-time major winner Jack Nicklaus

World number two has won four majors in his career so far, the last of which came in 2014

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Rory McIlroy of Northern Ireland tees off at the WGC-HSBC Champions in Shanghai. Photo: AFP
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