Just two full-days into the tournament, two players have already retired. On Monday, British player Kyle Edmund was forced to retire in the 5th set due to leg cramps. Today, Argentine Diego Schwartzman battled through muscle cramps for several games, before eventually collapsing with leg cramps in the 4th set. Schwartzman was forced to retire and had to be physically carted off the court on a stretcher, unable to walk.
In a great show of sportsmanship, the video above shows Schwartman's opponent, Australian John Millman, consoling him before accepting his victory.
This tennis season has already been exemplary for the class that's been displayed, and I've got to give a shout-out to Jack Sock, who did something I've never seen before in a tournament. Up 5-4 in the first set of a Hopman Cup match, and receiving serve from opponent Lleyton Hewitt, Sock corrected an line official's call, to his own detriment. Hewitt's serve, an ace, was originally called out. As Hewitt pulled a ball from his pocket and prepared for to hit his second serve, Jack Sock interjected, and told Hewitt to challenge the call, because the original serve was in. Sure enough, Sock was right, and Hewitt was awarded the point: