Filip Krajinovic demonstrated his significant potential early in his career, signing with the prestigious Nick Bollettieri Tennis Academy in Bradenton, Florida, in 2007. He achieved a career-high junior ranking of world No. 6 in February 2009, making his professional debut in 2008 and his ATP Tour debut at the 2009 Serbia Open. Krajinovic steadily climbed the ranks through strong performances, breaking into the top 100 in 2014 by securing multiple Challenger titles.
His consistent play earned him recognition as a formidable competitor on various surfaces. A pivotal moment arrived in 2017 when Krajinovic made a remarkable run to the Masters 1000 final at the Paris Masters, becoming the first qualifier since 2012 to reach such a prestigious final. This extraordinary achievement propelled him to a then career-high ranking of world No. 33.
The same year, he was a key semifinalist at the Davis Cup, representing the Serbian national team. His ascent continued, reaching his career-high singles ranking of world No. 26 in April 2018. Throughout this period, Krajinovic showcased resilience by navigating several injury setbacks, including shoulder issues in 2011 and further challenges with his foot, ankle, and hand in 2018, which he consistently overcame to maintain his high-level performance.
Concluding a distinguished career marked by resilience and high-level competition, Filip Krajinovic officially retired from professional tennis in September 2024. His career culminated with an impressive prize money total exceeding $6 million, reflecting years of dedication and success on the global circuit. As a former professional tennis player known for his defensive game and ability to perform on various surfaces, Krajinovic leaves a legacy of strategic play and consistent achievement in the sport.