Eh, people spend money on all sorts of irrational things - eg many will gladly pay $30-40 for a tennis shirt that has 'adidas' or 'nike' on it, vs $10-15 for the same thing sans logos at target.
Anyway, best tip for singles: get fit, and when you're on the court, focus on your footwork and don't get lazy. Most other things follow from that.
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