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String Tension by StyleRight tension for your string type and playing style. Grip Size by HandThe right grip size based on your hand measurement.Plain note about money: Some product links are affiliate (eBay Partner Network). Small commission, doesn't change your price.
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Gear actually worth buying
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Intermediate tennis racketFor club-level players: 100-110 sq in head, 10-11oz strung. Wilson Clash and Babolat Pure Drive are the reference points.
Tennis balls (case of 24+)Balls matter more than most players admit. Penn Championship or Wilson Championship for practice; Pressureless for wall work.
Court-specific tennis shoesHard-court and clay shoes have different outsoles. Don't use running shoes — ankle roll risk and outsole wear are different problems.
Racket bag (6-pack)Thermal-lined bags protect strings from heat. Six-pack size handles two to three rackets plus gear without being a full duffel.
Overgrip tapeTourna Grip and Babolat Pro Tour are the two grips serious players rotate through. Buy in 30-pack rolls — they're consumables.