Cetkovská withdrew from the Australian Open due to a hip injury.
Cetkovská returned from injury in March at the Indian Wells Masters.
She lost in the first round to American Christina McHale.
At the Miami Open, Cetkovská was defeated in the first round by wildcard Paula Badosa Gibert.

She suffered a first-round loss at the French Open to Misaki Doi.

Cetkovská began her grass-court season seeded third at the Surbiton Trophy.
After a first-round win over British wildcard Laura Deigman, she faced another British player, Naomi Broady.
Cetkovská ended up losing in the second round to Broady.
She had another first-round loss, this time at the Birmingham Classic, to qualifier Marina Erakovic.
Cetkovská qualified for Wimbledon defeating Renata Voráčová, 15th seed Donna Vekić, and Elise Mertens.
In the main draw, she lost in the first round to Tímea Babos.

Two weeks later, Cetkovská competed at the ITS Cup in her home country where she was the third seed and the defending champion.
She advanced to the final with wins over Rebecca Šramková, Irina Ramialison, sixth seed Akgul Amanmuradova, and Ekaterina Alexandrova.
Cetkovská ended up losing in the final to top seed and compatriot Barbora Krejčíková.
During the week of July 27th, Cetkovská traveled to Poland to play at the Powiat Poznański Open.
She would go on to win the title defeating Sofia Shapatava, seventh seed Romina Oprandi, third seed Richèl Hogenkamp, qualifier and compatriot Martina Borecká, and fourth seed Jeļena Ostapenko.
The week of August 10th saw Cetkovská playing a minor league tournament in Prague, the Prague Open, which was a brand new tournament.
Playing as a wildcard, she lost in the semifinals to seventh seed María Teresa Torró Flor.

Cetkovská had a great run at the US Open.
She started off the tournament by beating Christina McHale in the first round in three sets.
In the second round, Cetkovská had a huge win, upsetting fourth seed and last year finalist, Caroline Wozniacki.
She saved four match points to complete the upset.
In the third round, she lost to 26th seed and eventual champion Flavia Pennetta.
Nevertheless, this was her best result at the US Open.

After the US Open, Cetkovská played at the L'Open 35 de Saint-Malo.
After winning her first-round match, she retired during her match against Laura Pous Tió.
This ended up being her last tournament of the year.

Cetkovská ended the season ranked 131.
Cetkovská withdrew from the Australian Open due to a hip injury. Cetkovská returned from injury in March at the Indian Wells Masters. She lost in the first round to American Christina McHale. At the Miami Open, Cetkovská was defeated in the first round by wildcard Paula Badosa Gibert.
She suffered a first-round loss at the French Open to Misaki Doi.
Cetkovská began her grass-court season seeded third at the Surbiton Trophy. After a first-round win over British wildcard Laura Deigman, she faced another British player, Naomi Broady. Cetkovská ended up losing in the second round to Broady. She had another first-round loss, this time at the Birmingham Classic, to qualifier Marina Erakovic. Cetkovská qualified for Wimbledon defeating Renata Voráčová, 15th seed Donna Vekić, and Elise Mertens. In the main draw, she lost in the first round to Tímea Babos.
Two weeks later, Cetkovská competed at the ITS Cup in her home country where she was the third seed and the defending champion. She advanced to the final with wins over Rebecca Šramková, Irina Ramialison, sixth seed Akgul Amanmuradova, and Ekaterina Alexandrova. Cetkovská ended up losing in the final to top seed and compatriot Barbora Krejčíková. During the week of July 27th, Cetkovská traveled to Poland to play at the Powiat Poznański Open. She would go on to win the title defeating Sofia Shapatava, seventh seed Romina Oprandi, third seed Richèl Hogenkamp, qualifier and compatriot Martina Borecká, and fourth seed Jeļena Ostapenko. The week of August 10th saw Cetkovská playing a minor league tournament in Prague, the Prague Open, which was a brand new tournament. Playing as a wildcard, she lost in the semifinals to seventh seed María Teresa Torró Flor.
Cetkovská had a great run at the US Open. She started off the tournament by beating Christina McHale in the first round in three sets. In the second round, Cetkovská had a huge win, upsetting fourth seed and last year finalist, Caroline Wozniacki. She saved four match points to complete the upset. In the third round, she lost to 26th seed and eventual champion Flavia Pennetta. Nevertheless, this was her best result at the US Open.
After the US Open, Cetkovská played at the L'Open 35 de Saint-Malo. After winning her first-round match, she retired during her match against Laura Pous Tió. This ended up being her last tournament of the year.
Cetkovská ended the season ranked 131.
Petra Cetkovská