By Zenos Frudakis - Zenos Frudakis, GFDL, https://commons.wikimedia.org/w/index.php?curid=34246736
Clue
Two less than one of his key rivals of the era, Gary Player.
Answer
Arnold tied for second 3 times - 1964, 1968, and 1970 – but he never won the US PGA Championship. As he did win each of the other three majors, missing out on the PGA stopped him from winning a career Grand Slam.
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