At the Grand Slam tennis tournaments, Cadanțu has won only one match, at the 2013 Wimbledon Championships.

Alexandra Cadantu was born in Bucharest, Romania. She began playing tennis at age 3 and she's coached by Emil Negoita. Her favourite surface is clay. Speaks Romanian, English and Spanish. Alexandra's goal is to reach Top 50 soon.

Cadantu started the year in Shenzhen. But was defeated by Bojana Jovanovski in the first round, 6–3 6–1. Her next tournament was in Sydney where she was defeated in the first qualifying round by Olga Puchkova, 6–2 6–4. Alexandra then lost to Heather Watson in the Australian Open first round, 2–6 6–3 6–2.

In February, she won her first match for the season in Cali, Colombia – defeating Laura Pous Tió, 3–6 6–3 6–1. But then she lost in the second round to Sesil Karatantcheva, 6–4 5–7 6–2. Reached quarter-finals in Bogotá, Colombia, defeating Maria Joao Koehler in the first round, 6–0 6–3, and Tereza Mrdeža in the second round, 4–6 6–3 6–4. She then fell in the QFs to Jelena Janković, 6–2 6–1. Then, in Acapulco, Mexico, Cadantu was defeated by Sara Errani in the first round, 6–3 6–2. In March, she fell in Miami first qualifying round to Stefanie Vögele, 6–3 6–3. She then lost to Madison Keys in the first round of Charleston, USA, 7–6 6–4.

She reached the SFs in Katowice, Poland in April, where she lost to Petra Kvitová, 6–0 6–4. On her road to the SFs, she defeated Yuliya Beygelzimer (7–5 6–2), Katarzyna Kawa (6–2 6–3), Raluca Olaru (6–0 6–0), Sabine Lisicki (7–5 6–2), Irina-Camelia Begu (4–6 6–3 6–4), and Shahar Pe'er (5–7 6–3 6–3). She has also reached the semifinals at the 2013 Budapest Grand Prix, where she lost in straight sets (2–6 6–7) to compatriot Simona Halep and eventual winner of the tournament.
Cadantu started the year in Auckland when she had to retire in her first round 6–1 4–0 down against Kurumi Nara. She also fell at the first round in Hobart – losing to Olivia Rogowska 7–6 6–1, Australian Open – losing to Flavia Pennetta 6-0 6-2 and in Rio de Janeiro – losing to Teliana Pereira 6-3 6-4.
Then things started to improve with a quarter-final at Florinopolis beatin wildcard Gabriela Cé 6-1 6-3 in the first round and Dinah Pfizenmaier 6-2 6-3 in the second before losing to Yaroslava Shvedova 6-3 6-3. She fell in the first round at Indian Wells and Miami, losing to rising stars Coco Vandeweghe and Zarina Diyas respectively. In Katowice she beat Yanina Wickmayer 3-6 6-1 6-1 before losing a tight three-set match to the third seed Carla Suárez Navarro 2-6 6-4 6-4. She then had a nine-match losing streak which included the French Open and Wimbledon which she snapped at the ITF 100k Contrexéville. She won the doubles title at Bucharest alongside countrywoman Ana Bogdan in her home city; they beat Çağla Büyükakçay and Karin Knapp in the final. Later in the year she reached the quarter-finals at ITF Saint-Malo, Monterrey and Victoria.
Players who have been ranked World No. 1 in boldface
Players who have been ranked in the World Top 20, but not in the World Top 10, in italic