17-year-olds Anastasia Potapova and Olga Danilovic are both making their debut in a WTA quarterfinal today. The last time two 17-year-olds were in the quarterfinals of a WTA tournament was Rabat 2007, when Caroline Wozniacki and Alizé Cornet both made it to the last eight (where they fell to Raluca Olaru and Aleksandra Wozniak respectively).
Wildcard Anastasia Potapova was the 2016 Wimbledon junior champion, and made her WTA debut by qualifying for the senior event the following year. The Russian was forced to retire in her first-round match against Tatjana Maria - but in February scored her first WTA main draw win against the German in St Petersburg. Ranked No.204, Potapova has compiled a 21-10 win-loss record in 2018, including three ITF finals in Sharm el Sheikh, Khimki and Rome.
Lucky loser Olga Danilovic became the first player born in 2001 to score a Top 20 win in Fed Cup zonal play in February, when she defeated Anastasija Sevastova 6-2, 6-4. The Serb ended 2017 ranked No.465, but a 27-8 record this year - including ITF trophies in Santa Margherita di Pula and Versmold - has rocketed her up to her current No.187.
Playing her third WTA main draw, Tamara Zidansek has also made her first quarterfinal - scoring her maiden Top 20 win over Daria Kasatkina en route. The Slovenian, who was ranked No.205 in March, has risen to a career high of No.90 this week, and has a 49-13 record in 2018.
No.1 seed Julia Goerges, champion at last year's Kremlin Cup, is now riding a seven-match winning streak in Moscow. The German has also won 10 of her past 11 matches on Russian soil, having reached the St Petersburg semifinals in February.
25-year-old Valentyna Ivakhnenko has also reached her maiden WTA quarterfinal. The Russian made her WTA main draw debut in Palermo in 2012, losing to Laura Robson, and also qualified for Baku in 2015 - but only this year has she made it to multiple main draws. Moscow is her third of the year following Istanbul and Gstaad, and her first-round win over Danka Kovinic was her first at this level.
The quarterfinal between No.3 seed Anastasija Sevastova and No.5 seed Aliaksandra Sasnovich is a reprise of their Brisbane semifinal in the first week of 2018. Their only previous encounter, it was won by Sasnovich 7-6(3), 6-4. This week marks the Belarusian's first ever WTA quarterfinal on clay.
ORDER OF PLAY
CENTER (starts 11am)
Julia GOERGES (GER)  vs [LL] Olga DANILOVIC (SRB)
[Q] Valentyna IVAKHNENKO (RUS) vs [WC] Anastasia POTAPOVA (RUS)
Laura SIEGEMUND (GER) vs Tamara ZIDANSEK (SLO)
Not before 5.30pm
Anastasija SEVASTOVA (LAT)  vs Aliaksandra SASNOVICH (BLR) 
COURT 1 (starts 1pm)
Kateryna KOZLOVA (UKR) / Natalia VIKHLYANTSEVA (RUS) vs Rika FUJIWARA (JPN) / Darija JURAK (CRO)
Not before 4pm
Nicola GEUER (GER) / Laura SIEGEMUND (GER) vs Anastasia POTAPOVA (RUS) / Vera ZVONAREVA (RUS)