Rafael Nadal uses a forehand grip close to a full western, which places the palm of the hand underneath the racket handle:
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Nadal is on Bevel 5 or 6 (Western grip):
www.nytimes.com
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Nadal is on Bevel 5 or 6 (Western grip):

The Evolution of Tennis in Four Grips (Published 2019)
Over the years, players have moved their grips farther and farther under the handle. It creates a lot of topspin, and some strange looking swings.