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John Breech on Twitter: "The tennis challenge system is my favorite challenge system ever invented. Pretty sure tennis is the only sport where I root for challenges #WimbledonFinal #Wimbledon #Federer #Djokovic https://t.co/7AYRxa1j2u" /
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Closest challenge ever? 99% out; Del Potro makes an ace with the smallest marginal possible : r/tennis
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When can a Wimbledon player challenge a call, what is Hawk-Eye and how many challenges do players get? | The Sun
![Project Invent on Twitter: "A key part of making for others is #empathy, so every Monday, Project Invent will be releasing Micro #Maker empathy challenges for kids to try out! This week: Project Invent on Twitter: "A key part of making for others is #empathy, so every Monday, Project Invent will be releasing Micro #Maker empathy challenges for kids to try out! This week:](https://pbs.twimg.com/media/EVf1FzkUEAEtbfJ.jpg)