Russia's Svetlana Kuznetsova produced another extraordinary comeback to win her second straight match at the WTA Finals on Wednesday, sealing a place in the semi-finals.
Svetlana Kuznetsova hacked off her own hair with a pair of scissors and burst into tears before saving a match point and beating the defending champion Agnieszka Radwanska 7-5 1-6 7-5 at the WTA Finals on Monday.
The latest tantrum by Australia's Nick Kyrgios has attracted more than a fine and condemnation as sports stars and experts wonder if he needs help to overcome his demons.
Jo-Wilfried Tsonga ousted racket-smashing teenager Alexander Zverev at the Shanghai Masters on Thursday, denying the young German a potential match-up with his elder brother, Mischa.
Nick Kyrgios claimed his third, and biggest, title of the year, when rallying to beat David Goffin at the Rakuten Japan Open on Sunday.
Rafael Nadal suffered another early loss when he fell to Grigor Dimitrov for the first time 6-2, 6-4 in the China Open quarterfinals on Friday.
Marin Cilic and David Goffin advanced to the semifinals of the Japan Open on Friday, and they will play each other for a spot in the final.
Maria Sharapova returns to the court for the first time since her doping ban was reduced when she makes her World Team Tennis Smash Hits debut next week in Las Vegas.
Angelique Kerber lost for the first time since becoming the No. 1-ranked player, losing to Petra Kvitova in the third round of the Wuhan Open on Wednesday.
Caroline Wozniacki overpowered Japanese teenager Naomi Osaka 7-5, 6-3 to win the Pan Pacific Open on Sunday.