The 26-year-old Spaniard struggled to hit the fairway early on in the second round, but found his footing on the back half of the course, carding a respectable one-under par 70, with a pair of birdies on the final five holes in San Diego.

"I just have to swing a little bit harder with the driver, and that's exactly what I did starting on 13," the five-time PGA Tour winner told reporters.

"Those drives ... on 13, 15, 17, and 18 were absolutely perfect. They were all exactly the way I thought they were going to be, the way I visualised them. Sometimes that's what you need to do.

"I focus more on visualising the shots rather than just getting too technical because I started thinking of it too much on the swing, and I just kind of let it come to me."

RIGHT: Rahm shows his frustration with a missed chip shot during the second round. PHOTO: Getty Images. 

The solid performance comes after Rahm was forced to abandon a six-shot lead having completed 54 holes at the Memorial Tournament in Ohio earlier this month after returning a positive coronavirus test.

"What happened a couple of weeks ago is something I can't control, unfortunately, but what I can do is control what I do every time," said Rahm.