<div id="ooyalaplayer" style="width: 800px; height: 450px;"></div><div style="display:none;" id="kalturavideoplaceholder">kalturavideoplaceholder</div><div><div><script src="https://apis.google.com/js/platform.js"></script><div class="g-ytsubscribe" data-channel="BusinessInsider" data-layout="full" data-count="default"></div></div></div><p class="embed-spacer"></p><p>Leading five games to four, American tennis player Jack Sock made a bold move in Australia this week.&#xa0;</p><p><em>Produced by&#xa0;<a href="http://www.businessinsider.com/author/emma-fierberg">Emma Fierberg</a><br /></em></p><p><strong>Follow BI Video:</strong>&#xa0;<a href="https://www.facebook.com/BusinessInsider.Video">On Facebook</a></p>

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American tennis player displays remarkable sportsmanship by telling his opponent to challenge a bad call

kalturavideoplaceholderLeading five games to four, American tennis player Jack Sock made a bold move in Australia this week.&#xa0;Produced by&#xa0;Emma FierbergFollow BI Video:&#xa0;On Facebook

kalturavideoplaceholderLeading five games to four, American tennis player Jack Sock made a bold move in Australia this week.

American tennis player displays remarkable sportsmanship by telling his opponent to challenge a bad call

Emma Fierberg

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