Filip Krajinović (Serbian Cyrillic: Филип Крајиновић, pronounced ; born 27 February 1992) is a Serbian professional tennis player who achieved a career-high singles ranking of world No. 26 on 23 April 2018. He made his ATP World Tour debut at the 2009 Serbia Open, losing in the first round. His best individual result has been a Masters 1000 final. He played a Davis Cup semifinal with the Serbian national team. He holds ATP main draw victories over former or current top 10 players such as Novak Djokovic, Stan Wawrinka, Gilles Simon, David Goffin (twice), Marcos Baghdatis, John Isner, Fabio Fognini and Daniil Medvedev and has a victory in a Masters qualifying round over former top 5 player Gastón Gaudio.
Krajinović started playing tennis in local tennis clinic TK Žak. In 2006, he reached the fourth round of 2006 Orange Bowl, losing to Bernard Tomic. Soon after, in 2007, he signed a contract with prestigious Nick Bollettieri Tennis Academy in Bradenton, Florida. The same year, Krajinović won four junior singles titles — Pančevo, Atlanta, Texas, and Boca Raton.