The best replacement for topspin is bandcamp.

The best alternatives to topspin are rated as following:
★★★★★  bandcamp
★★★★★  backspin
★★★★  slice
★★★  virtua tennis
★★  reverbnation
★  flat shot
★  fanbridge
★  slice backhand
  flat forehand
  nimbit

Your alternative for topspin is not listed? Suggest!
Speaking about topspin, one probably shouldn't forget about forehand.

Other search terms related to topspin and their ratings are:
★★★★★ forehand
★★★★ eastern forehand
You have in mind a companion for topspin and it is not yet here? Propose!



Google Trends

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topspin
bandcamp
backspin