Australian Open champion Naomi Osaka says she had to be a "robot" and turn off her feelings to hold her nerve and win the final against Petra Kvitova.
The Japanese, 21, had tears in her eyes after having three match points saved by her Czech opponent in the second set - before winning 7-6 (7-2) 5-7 6-4.
"You know how some people get worked up about things? That's a very human thing to do," said Osaka.
"Sometimes I feel like I don't want to waste my energy doing stuff like that."
US Open winner Osaka became the first player since American Jennifer Capriati in 2001 to follow her maiden Grand Slam title with victory at the next one.