Who are you? Guide to French Open stars' rivals

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Paris (AFP)

Who are the players looking to take down the top stars in this year's French Open:

Alexander Dolgopolov (UKR)

1st rd opponent: Defending champion Rafael Nadal

Dolgopolov:

Ranking: 54

Age: 29

Head to head with Nadal: Nadal leads 7-2

French Open best: 3rd rd in 2010 and 2011

-- Dolgopolov is a former world number 13 whose career has been curtailed by a battle against Gilbert's Syndrome, a condition which affects the blood and liver. Has lost all three career clay court meetings with Nadal without winning a set. His best peformance at a Slam was a run to the quarter-finals of the Australian Open in 2011.

Ricardis Berankis (LIT)

1st rd opponent: German second seed Alexander Zverev

Ranking: 92

Age: 27

Head to head with Zverev: First meeting

French Open best: 1st rd in 2013, 2015, 2016 and 2017

-- In four appearances at Roland Garros, Berankis has never won a match at the the tournament. Hasn't won a match on main ATP Tour this year since February. Best Grand Slam performance was a run to the Australian Open third round in 2011 and 2013 where he lost to Andy Murray.

Kristyna Pliskova (CZE)

1st rd opponent: Three-time champion Serena Williams

Pliskova:

Ranking: 70

Age: 26

Head-to-head with Williams: First meeting

French Open best: First round in 2013, 2016 and 2017

-- The Czech has never managed to match the achievements of her twin sister and former world number one Karolina, and is yet to reach the second week of a Grand Slam tournament. The left-handed Pliskova won her only WTA Tour title in Tashkent in 2016.

Alison Riske (USA)

1st rd opponent: Top seed Simona Halep

Riske:

Ranking: 105

Age: 27

Head-to-head with Halep: Halep leads 2-0

French Open best: Second round in 2014

-- Riske announced herself to American tennis fans with a surprise run to the 2013 US Open last 16 as a wildcard, including a victory over former Wimbledon champion Petra Kvitova. But she has struggled this year and dropped outside the world's top 100, failing to win a match on clay.