Ash Barty is feeling hugely satisfied after surviving an almighty scare to eke out a three-set win in the first match of her Miami Open title defence.
The world No.1 saved a match point before beating Kristina Kucova 6-3 4-6 7-5 to advance to the last 32.
Barty had to fight back from 2-5 down in the deciding set.
"Never give up," she said.
"No matter what the result, no matter what we're feeling, no matter the conditions, we just never give up.
"Matches like that are extremely fulfilling, knowing that you have done the work over an extended period to just get over the edge and just get that result that you're after.
"Today was much more about the fight than the result, but certainly happy now to be able to give myself another chance in a couple days' time to be able to go again.
"I'm still in the tournament. I'm still in with a chance."
Barty seemed to have her round-of-64 match firmly under control when she rallied from an early deficit and grabbed the first set, which she won despite registering only 44 per cent of first serves in.
The continued low first-serve percentage, however, cost her in the second set, when she put only 47 per cent of her first deliveries in play and was broken by her Slovak opponent on two occasions, including in the final game.
In the decider, Barty nearly hit her way out of the tournament with numerous forehand unforced errors and some careless misses on the backhand side, including a drop shot in the net that gave Kucova a match point when she was serving at 5-3.
The 2019 Miami Open champion, however, dug deep to get back on serve and then broke once again to take a 6-5 lead in the third set.
The match had one more twist when Barty fell behind 0-40 when serving for the contest, but she reeled off the last five points to emerge victorious in her first tour match outside Australia in more than a year.
"My first bubble win, we'll say," Barty said.
"It is nice to be back on tour. It is nice to come back to a place here to Miami where we have had such good memories honestly. It's a beautiful place to play tennis."
The 2019 French Open winner will next take on the 2017 Roland Garros champion, big-hitting Latvian Jelena Ostapenko, in the round of 32 of this elite hard-court event.
In other women's singles round-of-64 action on Thursday, reigning French Open champion and Polish world No.16 Iga Swiatek cruised past the Czech Republic's Barbora Krejcikova 6-4 6-2, while fifth-ranked Ukrainian Elina Svitolina beat American Shelby Rogers 3-6 7-5 6-3.
Eighth-ranked Belarusian Aryna Sabalenka squeaked past Bulgaria's Tsvetana Pironkova 0-6 6-3 7-6 (11-9).