CC BY 2.0 — Wikimedia Sean O’Neil United States Coach Tennis coach and instructor contributing to stroke analysis and teaching methodology. Tennis coach and instructor. No videos available for this player yet. × Ask Coach AI about this technique Articles about Sean O’Neil Donna Vekic's Serve Vs. Coco Gauff's Brian Gordon and the 3D Markerless Revolution Coco Gauff’s Second Serve: A Technical Analysis On Court with Dr. Brian Gordon Compare technique with another player Select a player... A.J. Catanzariti A.J. 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