Oakmont (USA), June 13 -- Scottie Scheffler and Rory McIlroy - the world's top two - found Oakmont Country Club a bruising challenge on a first day at the US Open when only 10 of the 156 players ended under par.

Masters champion McIlroy had started well and was two under after nine holes, but then unravelled with four bogeys and a double bogey as he posted a four-over 74.

Scheffler, who came into the third major of the year as overwhelming favourite on the back of winning three of his past four tournaments, is three over par after an uncharacteristically ragged round that featured five bogeys.

"I made some silly mistakes and I just need to be a little sharper," said the American who won last month's US PGA Championship to add to his two...