Krejcikova has won singles tournaments of various national and international levels. Their greatest success she achieved as a 15-year-old, when he took the title in the “Under 14” Orange Bowl Open – one of the most prestigious junior tournaments – where his best rival was Angelique Kerber, with whom he played a long final (4:6, 3:6). In addition to the victory in the Orange Bowl Krejcikova won singles titles at international tournaments such as “Salinas”, “Banana Bowl” and “Gatorade”.
In doubles tournaments she won various juniors titles including winning a professional tournament – PTT Pattaya Open – in singles and doubles with fellow countryman Katerina Vankova.
In the year 2006, she also won several ITF titles such as “Banja Luka Open” and “Bol Junior Cup”. After a series of injuries, Krejcikova again began to play tennis for Sparta Prague. She became the best-ranked Czech female player in May 2010. In June of that year, she participated in her second WTA tournament in her life but lost in the qualifiers of the Prague Open to Martina Pavelecova.
In July 2011 Krejcikova won her first doubles match on a professional WTA tour at a tournament in Istanbul, where she reached the quarterfinals of doubles with Barbora Zahlavova-Strycova. In 2012, she regularly played for the Czech Fed Cup team and also won two ITF singles titles and one ITF doubles title.
In January 2015 Krejcikova took part in the Fed Cup final, where she played two singles matches against the Swiss team and the Czech Republic won 4:1. Thus she has helped her country to win its first title in 16 years.
Fed Cup participation includes all players who have played for the Czech Fed Cup team since 1993 when the competition was transformed to a World Group format. Krejcikova made her debut in the Fed Cup team in 2008. In 2010, she won both of her matches for a victory of the Czech Republic against Germany in World Group II play-offs. Two years later she participated in an unsuccessful qualification to the 2012 Fed Cup World Group, losing both matches from US and Italy.
In 2014 Krejcikova took part in the final competition of the Fed Cup and won both singles matches for a victory over Switzerland. This success made her one of the most successful Czech tennis players in Fed Cup so far.
During her career Krejcikova has regularly played ITF tournaments at home and abroad, winning numerous titles such as “Cagnes-sur-Mer” (Czech Republic), “Banja Luka Open” (Bosnia and Herzegovina), or “Yuxi” (China).
Krejcikova is coached by Petr Pala. Until the end of 2010, she was being coached by Matena Stoupalova. Her right hand is injured, so her serve and other shots are not as strong as they could be.
Krejcikova can play both doubles and singles, but she prefers playing doubles.
The greatest success for Krejcikova in tennis was winning the Orange Bowl International Tennis Championship as a 15-year-old girl in 2004
Krejcikova has played in various junior tournaments she won in singles and doubles. She is an experienced player in Fed Cup both in singles and doubles matches.
She has also reached the quarterfinals of a WTA event before playing the ITF tournament (2011 Istanbul).