Elina Svitolina is still chasing a maiden Grand Slam, and this second-round opponent is going to be a tricky one, rising star Coco Gauff, who doesn't turn 17 until next month.

GAUFF 4-6, 3-6 SVITOLINA: Quick feet from Svitolina again, looming ominously towards Gauff at the net, and she finishes it off in style. What a great performance from the fifth seed to take this in straight sets.

GAUFF 4-6, 3-5 SVITOLINA: Right, then, Svitolina to serve for the match. The crowd are trying to urge Gauff on but it's a very tough challenge for her now.

GAUFF 4-6, 3-4 SVITOLINA: Elina Svitolina is looking very, very good here. Every time Gauff looks like she might be able to step up her game, Svitolina just crushes her.

GAUFF 4-6, 3-3 SVITOLINA: This is brilliant from Gauff. Svitolina is nudging once more at that serve and with the help of the crowd, who are firmly behind her, the young American roars her way to another hold.

GAUFF 4-6, 2-3 SVITOLINA: Svitolina keeps her head wonderfully here as Gauff gets a sniff of break points, she stays balanced and keeps her radar.

GAUFF 4-6, 2-2 SVITOLINA: Another hold of serve as that speed ramps up again from Gauff.

GAUFF 4-6, 1-2 SVITOLINA: You don't often see Elina Svitolina running to the net, but she's doing that now. Good play from her.

GAUFF 4-6, 1-1 SVITOLINA: Gauff is fascinating to watch, how composed she is even under this pressure.

GAUFF 4-6, 0-1 SVITOLINA: Gauff has break points here but she's being outhit, and as Svitolina forces her across the court again, she takes a tumble, turning her left ankle slightly.

GAUFF 4-6 SVITOLINA: First set, first break, and Svitolina clenches her fist. Clutch game from her, pouncing on Gauff's first serve that has started to crumble.

GAUFF 4-5 SVITOLINA: Gauff has got Svitolina moving all over the place, but the Ukrainian reasserts herself to complete the game with an ace.

GAUFF 4-4 SVITOLINA: First double fault for Gauff, but she's 40-0 up so it doesn't matter too much.

GAUFF 3-4 SVITOLINA: Both players will be pleased with their start at the sit-down, some really good serving and only a single break point opportunity for the pair of them combined - that coming for Gauff in the first game.

GAUFF 3-3 SVITOLINA: Coco Gauff is currently running at 100 per cent on first serves. Not bad at all.

GAUFF 2-3 SVITOLINA: Svitolina is really taking it to Gauff. She's moving quickly and smoothly.

GAUFF 2-2 SVITOLINA: Mind you, Gauff is racking up the speed on the serve too, a touch quicker than her opponent at the moment.

GAUFF 1-2 SVITOLINA: It's still 88 degrees in Melbourne! Imagine. Svitolina is still pelting down that serve.

GAUFF 1-1 SVITOLINA: Much easier on serve for Gauff.

GAUFF 0-1 SVITOLINA: Gauff is hitting some very crisp shots here but Svitolina finds the power to hold. Intriguing start.

Gauff loses the toss, and Svitolina elects to serve.