Reflecting on Kyrgios' season as he calls it a wrap

Nick Kyrgios has ended his season, though there's not much left to play. For those, like Kyrgios, not playing in the ATP Finals in London, the only events left are two ATP 500s next week and the ATP Masters 1000 in Paris.

The Australian posted a note to Twitter, citing his need to recover fully from a hip injury sustained at Queen's Club in June. Tomas Berdych also chose Thursday to post his end-of-season news on Twitter.

Kyrgios, who won three ATP titles in 2016, will now finish 2017 without any. This year has been incredibly up and down for the 22-year-old.

In the second round of the Australian Open, he blew a two-sets-to-none lead to Andreas Seppi, who won in the final set 10-8. But Davis Cup action, in which he won a singles rubber, helped him right the ship.

What followed was a string of good runs in the spring—quarterfinals or better in Marseille, Acapulco, Indian Wells and Miami—but no tournament wins.

After an unremarkable clay season, he headed to Queen's Club, where he aggravated a hip injury and retired against Donald Young. He then tried to play Wimbledon, but retired after losing the first two sets to Pierre-Hugues Herbert.

Back on hard courts, Kyrgios retired in Washington for the third time in a row. In Montreal, he made the round of 16, but lost in straight sets to Alexander Zverev.

Then came another high—his stunning run in Cincinnati. He crushed Rafael Nadal 6-2, 7-5 en route to his first ATP Masters 1000 final, where he was outplayed by Grigor Dimitrov.

At the US Open, he suffered a first round, four-set loss to the then-world No. 235, fellow Aussie John Millman.

Kyrgios's autumn looked promising as he made the Beijing final, besting both Zverevs along the way. But, in the title bout, Nadal got his revenge with a two-sets win.

Then came the abrupt retirement against Steve Johnson in Shanghai, for which he was fined $10,000 plus his prize money.

On Wednesday, the world No. 20 played his final match of the year, a three-set loss to Ruben Bemelmans in Antwerp.

As for what will happen in Kyrgios's 2018, the only safe prediction is that he will be unpredictable.