PGA Championship: Jordan Spieth loses his cool

It has not been a stellar 2018 for Jordan Spieth. Outside of a third-place finish at the Masters, the former world No. 1 has lost his mojo for much of the season. He missed the cut at the U.S. Open, blew a share of the third-round lead at the British with a final round 76 and has one top-10 finish in his last nine starts.

A breach of golf etiquette?

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