Top 5 Unseeded Grand Slam Winners

2017 French Open - Day Fifteen
Ostapenko with the Coupe Suzanne Lenglen

2. Sloane Stephens - US Open 2017

2017 US Open Tennis Championships - Day 13
Stephens had a dream run to the Slam title at home

Sloane Stephens burst into the scene when she reached the 2013 Australian Open semi-finals but faded off soon after. A month before the US Open in 2017, she was ranked 934 due to injuries and poor form. She came into the tournament due to protected ranking, a provision for players who've had a long-term injury.

The American didn't seem like she was returning from a layoff when she got through to the 2nd round and defeated 11th seed Cibulkova. She made it to the quarters and beat another seed -- this time the 16th seeded Sevastova.

In the semi-finals against fellow American Venus Williams, Stephens got the 1st set but gave away the second 6-0. In a tense decider, she won the tie-break to beat the 9th seed and enter the final. She saved the best for the last match, destroying Madison Keys 6-3, 6-0 to win the US Open. With that, Sloane Stephens won her first Grand Slam, inspiring loads of people on the way with such an incredible comeback.

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