If this was the last Australian Open singles match of Nick Kyrgios' career — and, to be sure, it's hard to know with him, no matter what came out at his news conference — the big-hitting, big-talking tennis player went out rather quietly Monday night.

Nick Kyrgios has made several comments in recent months that suggest he may be closing in on retiring from tennis - the latest coming after his Australian Open defeat

Down here, it’s all about their own tennis yin and yang. One is a top 10-player who will do whatever he can to avoid controversy, while dedicating every ounce of his energy to the sport. The other is an unranked unicorn,