Sportsmanship: Jack Sock encourages challenge against himself

All right, this is pretty sweet: Jack Sock was playing Lleyton Hewitt in the Hopman Cup in Perth, Australia. Hewitt fired a serve past Sock that was called out, and was preparing for his second serve when Sock called out, "That was in, if you want to challenge." Hewitt, not quite believing what he'd heard, paused for a few seconds, then challenged. Sure enough, the serve was good.

Hewitt was trailing 4-5 in the first set at the time of the serve, but went on to win that set 7-5 and the match 7-5, 6-4. Sock lost the match but, yes, won plenty of admiration for his sportsmanship.

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Jay Busbee is a writer for Yahoo Sports and the author of EARNHARDT NATION. Contact him at jay.busbee@yahoo.com or find him on Twitter or on Facebook.