Here's a sample of the speed of the first serves of the qualifiers. I just took it at random. I can't remember which speed is for Donati or Sugita. You can see there 178kph and 193kph. To put this in perspective, Serena Williams' average speed for her first serves in the 2014 US Open was 173kph. So some of Serena's serves can be faster than these guys!
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