Rory McIlroy knows he's got his work cut out to beat world golf number one Scottie Scheffler at the US Open this week.
They're paired together - along with Xander Schauffele - in the first two rounds.
Scheffler's won five of his last eight tournaments.
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The American also faced the drama of being arrested on his way to the PGA Championship.
McIlroy says Scheffler's so hard to stop.
