In July of the same year, she won a low-level Grade-4 title at the Safina Cup in singles event, defeating Petra Krejsová in the final.

In March 2008, she won her first doubles title at Grade 2 level Luxembourg Indoor Junior Open, partnering with Ksenia Lykina.

[11][12] In June 2008, she made her debut at the French Open, recording her first match-win at a Grand Slam tournament over Irina-Camelia Begu, before she was defeated by Lykina in the second round.

[13] In April 2008, she received a wildcard for playing in qualification at the Prague Open but failed to qualify after a first-round loss to Klaudia Jans.

She defeated qualifier Kristina Mladenovic and sixth seed Petra Kvitová but later was eliminated by third-seeded Iveta Benešová.

[16][18] In late 2011, Diyas underwent shoulder surgery and did not play tennis for the next seven months, which caused her to fall in the rankings, dropping her outside the top 300.

[17][19] The following year in May, she made her return on the ITF Circuit at the Kangaroo Cup where she failed to qualify for the main draw.

Her only ITF title of the year came in October at the $25k event in Makinohara, where she defeated rising Swiss junior and future top-ten player Belinda Bencic to clinch victory.

[14] She then advanced to another ITF Circuit final at the Caesar & Imperial Cup in Taipei but lost to Paula Kania, in straight sets.

[14] She then traveled to the United States to compete at the Miami Open, qualifying for the main draw and getting past Alexandra Cadanțu before losing to Sloane Stephens in the second round.

[27] Then, in her best result at the US Open to date, the unseeded Diyas advanced to the women's singles third round where she lost in straight sets to 17th seed Ekaterina Makarova, earning $105,090.

[30][16] After that, Diyas reached her first WTA Tour final at the Japan Women's Open where she lost to Samantha Stosur in straight sets.

[34] Diyas also played doubles with South African Chanelle Scheepers, and they advanced to the second round, before losing to the 16th-seeded German team of Julia Görges and Anna-Lena Grönefeld, in straight sets.

At the Dubai Tennis Championships, a Premier 5 tournament, she won against two German players, Annika Beck and Andrea Petkovic, before she lost to Ekaterina Makarova in the next round.

[40] Prior to Wimbledon, Diyas was defeated by lower-ranked players in two warm-up tournaments, losing to 129th-ranked Sachia Vickery at the Nottingham Open and to 146th-ranked Johanna Konta at the Eastbourne International.

[41] Diyas, however, reached the round of 16 at Birmingham by defeating Kateryna Bondarenko in straight sets and through the withdrawal of Victoria Azarenka.

[16] Despite the slow start on grass that left her unseeded at Wimbledon, Diyas managed to advance to the fourth round for the second consecutive year.

[46][47] In the first round of the US Open, Diyas was defeated by Polona Hercog,[48] so she failed to repeat her third-round appearance from the previous year.

[17] Diyas started the year playing at the Shenzhen Open, where she recorded her first win of the season against qualifier Zhang Kailin.

She lost in the opening rounds of her first four tournaments of the season before scoring her first wins at the Blossom Cup in Quanzhou, reaching the quarterfinals and losing to Zheng.

[14] The following week, she managed to reach the quarterfinals of the WTA 125 Zhengzhou Open but then lost to the top seed Peng Shuai.

She won her first two matches against Han Xinyun and Arina Rodionova but lost to another returning player, Petra Martić, in the third round.

[17][16] In March, Diyas reached the fourth round of a Premier Mandatory event at the Miami Open but had to retire while a set down in her match against Karolína Plíšková.

[61] In May, she reached the quarterfinals of a WTA Tour clay-court event for the first time in her career at Strasbourg, losing in straight sets to the eventual champion Anastasia Pavlyuchenkova.

[63] In her first-round match against Sam Stosur at the Nottingham Open, Diyas suffered a serious knee injury that saw her miss the entire grass-court season.

[71] Diyas recorded wins against Tamara Zidanšek and Bernarda Pera to reach the third round of the 2021 Australian Open, where she lost to Garbiñe Muguruza.

Her serve, while not necessarily a weapon in her arsenal, is quite effective when placed properly and she employs a tactic of a delayed service motion, which often prevents her opponents from appropriately timing a return.

[97] In 2018, she split with Ma and started a collaboration with two Italians, Roberto Antonini as her coach and Carlo Bilardo as her athletic trainer.

[102] In an interview with Tennis Prose, Diyas stated that her favourite tournament is Wimbledon, which she loves for its tradition and history.

[107] Only main-draw results in WTA Tour, Grand Slam tournaments, Fed Cup/Billie Jean King Cup and Olympic Games are included in win–loss records.