Former Open champion Louis Oosthuizen's unique celebration of his unwelcome 'career Grand Slam' after the weekend's US PGA Championship has proven a hit on social media.

The 34-year-old South African - who won the 2010 Open Championship, was joint runner-up with Francesco Molinari and Patrick Reed at the US PGA Championship at Quail Hollow over the weekend - finishing two shots behind first-time major winner Justin Thomas of America after bogeying the final hole.

This marked Oosthuizen's fourth second-place finish in a major, after also missing out at the Masters in 2012 and the US Open and the Open in 2015.

He joins select company to have achieved a career Slam of 2nd-place finishes - including
former world number one Greg Norman who finished runner-up in majors eight times: three times at the Masters, twice at the US Open, once at The Open, and twice at the PGA.

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Jack Nicklaus, who with 18 major titles is widely regarded as one of the greatest players of all time, was runner-up a record 19 times, including seven at The Open.

Shortly after boarding his plane after the tournament, Oosthuizen, who has over 74,000 followers, took to Twitter to congratulate Thomas on his win - and proceeded to serenade his followers by lip-syncing to the hits song 'Rise Up' by American Andra Day.

The clip was retweeted more than 17,000 times and liked over 44,000 times.

It even drew some reaction from fellow golf stars, with two-time PGA Tour winner Kevin Kisner calling it "world class" and Canadian Graham DeLaet Canadian Graeme DeLaet commenting" "Those vocals bud . . . wow!"