Coco Gauff made her WTA Tour debut in March in Miami, beating Catherine McNally 3-6, 6-3, 6-4. She would go on to lose to 14th seed Daria Kasatakina in the next round (Getty)

Coco's breakthrough: All Gauff's singles wins in 2019

A rollercoaster Linz semifinal saw Jelena Ostapenko save three match points - one in the second set returning at 5-6, two in the decider serving at 4-5 - before overcoming Ekaterina Alexandrova 1-6, 7-6(5), 7-5 (GEPA Pictures/Matthias Hauer)

Great escapes: Ostapenko saves match points for second time in 2019 in Linz rollercoaster

Julie Goerges is the reigning champion, having defeated qualifier Belinda Bencic, 6-4, 7-5 in 2018 as No.1 seed

Lighting up Luxembourg: A decade of champions

Francesca Schiavone was the first winner of the Kremlin Cup as a Premier tournament back in 2009. She beat Olga Govortsova, 6-3, 6-0. (Getty)

Kremlin crackers: A decade of champions in Moscow from Schiavone to Kasatkina

In 16 months since returning from injury unranked in April 2018, 20-year-old Ma Shuyue has rocketed to World No.224 after winning two ITF W25s and reaching the Anning 125K QFs, and made her WTA debut at home in Tianjin as a lucky loser (Tianjin Open)

Welcome to the Tour: Ma, Grabher make WTA debuts in Tianjin, Linz

Bianca Andreescu has enjoyed a stellar rise to WTA World No.5. Triumph at the US Open is her highlight moment of 2019. (Getty)

The WTA Top 10 and their 2019 best result: Osaka back into the Top 3

Caroline Garcia is the defending champion, having shocked Karolina Pliskova, 7-6(7), 6-3 in 2018. (Getty)

Five stars: Tianjin champions from Riske to Garcia

Their second career meeting was at the 2018 Australian Open (Getty)

Rivalry record: Ashleigh Barty vs Naomi Osaka

Wozniacki celebrated her 2018 success with a selfie. She beat Anastasija Sevastova, 6-3, 6-3 in the final and did not drop a set all week. (Jimmie48/WTA)

Chinese lanterns: Beijing champions from Kuznetsova to Wozniacki

The runner-up in Tashkent, Sorana Cirstea, has leaped 21 places following that run. She is the WTA World No.75. (Tournament)

Ranking Rockets: Cirstea, McHale and Kuznetsova make big gains

In Aryna Sabalenka's first ever tournament as defending champion, the Belarusian became the first ever player to defend a Wuhan title in 2019, beating Alison Riske in the final (Getty)

Repeat defenders: The last 25 successful WTA title defences

Zheng Saisai thrilled her home crowd in the first round of Beijing with a knife-edge 4-6, 6-3, 7-6(5) defeat of Monica Puig (3h2m) (Getty)

Marathon marvels: Zheng, Watson join Top 20 longest matches of 2019 in Chinese epics