Nick Kyrgios has officially continued his complex history in Shanghai. On Tuesday, he retired after losing just one set in a tiebreaker to Steve Johnson.

Kyrgios led for the majority of the tiebreak, but, while up 4-3, he was given a point penalty for an audible obscenity. 

Johnson later mini-broke for a set point after a spectacular one-in-a-million hot shot. After Kyrgios tried to dunk a jumping overhead, Johnson passed him with a reciprocal smash:  

Johnson went on to win the tiebreak with an ace up the T. Kyrgios retired immediately, without an obvious reason, leaving fans, Johnson and even the umpire, perplexed. 

The Australian later posted this explanation on Twitter:

In 2016, Shanghai was the site of one of the lowest points of Kyrgios's career: the infamous "tanking" incident against Mischa Zverev. Kyrgios was suspended for his behavior.