Last week's Masters champion Jon Rahm shook off his poor opening round and rebounded with Friday's best score, while Jimmy Walker opened up a three-stroke lead at the RBC Heritage.

Rahm had a bit of a hangover following his second major victory, beginning his week at Harbour Town Golf Links with a one-over 72, before showing the field how it was done with a seven-under 64 on his second trip around the course.

He birdied holes two, three, four and five to kick-start a bogey-free round with seven birdies overall, jumping from the wrong side of the cut line to a tie for 18th at six under.

Meanwhile, at the top of the leaderboard it was Jimmy Walker who raced clear of the pack, posting his second 65 in a row to head into the weekend at 12 under.

Walker, 44, is a six-time winner on the PGA Tour, but his last victory came at the 2016 PGA Championship, and he came into this event with only four made cuts from 12 starts this season.

Sinking it from off the green

Jimmy Walker extends his lead @RBC_Heritage pic.twitter.com/ImOrv0Deoc
— PGA TOUR (@PGATOUR) April 14, 2023

He has his work cut out for him to hold off a star-studded chasing pack, with world number two Scottie Scheffler joined by major champion Justin Rose and world number six Xander Schauffele at nine under.

Fellow top-10 talents Patrick Cantlay and Viktor Hovland are one stroke further back at eight under, where they are joined by English duo Aaron Rai and Tommy Fleetwood in a tie for fifth.

Jordan Spieth is tied for 10th at seven under with a group that includes Rickie Fowler and former RBC Heritage champion Matt Kuchar, and Rahm is joined at six under by reigning U.S. Open champion Matt Fitzpatrick.

Young South Korean phenom Tim Kim missed the cut by one stroke, while Max Homa had a week to forget, finishing at three over to miss the cut by five strokes.