Predictions for Madison Keys for Remainder of 2015 Australian Open

Madison Keys produced one of the upsets of the tournament so far on Saturday when she knocked Wimbledon champion Petra Kvitova out of the 2015 Australian Open in the third round.

The 19-year-old American put on an inspired performance as she downed the world No. 4 6-4, 7-5 in the Rod Laver Arena.

Now through to the last 16—the furthest she has ever gone in a Grand Slam—the teenager is set to face another unseeded American, Madison Brengle, on Monday in Melbourne.

Keys certainly showed against Kvitova that she is capable of competing at the very highest level and here we predict just what is in store for the young star in the remainder of the Australian Open.

Quarter-Finals Beckon for Keys

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Of those remaining in the women's draw in Melbourne, Brengle is arguably the easiest opponent Keys could have wished for in the last 16.

That is not to say that the 24-year-old will be easy pickings for Keys—she caused her own upset in Round 1, beating 13th seed Andrea Petkovic.

However, while both unseeded, Keys is ranked 35th in the world compared to Brengle's 64, per the WTA. 

Equally, Keys should be on a huge high after her massive win over Kvitova, which came courtesy of her tremendous power, per BBC Sport's Russell Fuller:

The youngster must focus on keeping up her consistency and taking the momentum of Saturday's performance into Monday, and she will beat Brengle if she reproduces her form from the Kvitova win.

The only issue is nerves. She was clearly overwhelmed immediately after her third-round win, per the Australian Open, and must not allow the occasion to get the better of her, as the fourth round in a Grand Slam is uncharted territory for Keys, although the same is true of Brengle:

With Lindsay Davenport—veteran of seven Grand Slam finals—as her coach, though, she should be well prepped, and a last-eight berth beckons with Keys' quality set to win out against Brengle.

Radwanska Set to Be Too Good in Last Eight

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Past the last 16, the guessing games become more complicated in predicting Keys' quarter-final opponent.

With a win over Brengle, Keys will meet either Venus Williams or Agnieszka Radwanska in the last eight, with the Pole the most likely to advance.

Should Williams pull off a shock, Keys will have a terrific chance of making an unexpected last four, but the inevitable outcome is that the teenager will have to get past Radwanska in the quarters.

In such an event, Keys' Melbourne adventure will end at the last-eight stage, as Radwanska is currently in fine form and looks set to go deep in the year's first Grand Slam.

The world No. 6 has seen off 30th seed Varvara Lepchenko, Johanna Larsson and Kurumi Nara on her way to the second week, winning one set 6-0 in all three of her straight-sets wins.

Radwanska looked impervious in winning the opening set 6-0 against Lepchenko, per ESPN Tennis, and looks to be building well into the tournament:

"

Radwanska loses just 10 points in a 25-minute, 6-0 first set against Lepchenko. #AusOpen

— ESPNTennis (@ESPNTennis) January 24, 2015"

Radwanska has the experience of the latter stages of Grand Slams—she reached the semi-finals in Melbourne last year—and Keys will inevitably be feeling the fatigue come the quarter-finals.

Even if Keys loses in the fourth round, it will have been an incredibly impressive showing from such a young player, and the Kvitoiva victory proved that she is set to go far in the future.

However, another victory is beckoning for Keys before a quarter-final defeat by Radwanska.