· Russia won all previous five editions of the women's duet free routine.
· Svetlana Kolesnichenko (RUS) won two gold medals in this event (one as reserve). She partners up with Alexandra Patskevich (RUS).
· A victory would put Kolesnichenko on par with Natalia Ishchenko (RUS) on three world championship gold medals in women's duet free routine. Only Svetlana Romashina (RUS, 5 gold medals) has won more.
· China finished second in duet free routine at each of the last three editions of the world championships.
· The Chinese duo who competed in this event in 2015, Huang Xuechen (CHN) and Sun Wenyan (CHN), will not compete in Budapest.
· In their place, sisters Jiang Wenwen (CHN) and Jiang Tingting (CHN) will make their world championship comeback. The Jiang sisters took the bronze medal in this event in 2009 and claimed the silver medal in 2011 and 2013.
· The Jiang sisters could both claim their fourth medal in this event. Only Svetlana Romashina (G5) has more.
· At the 2015 FINA World Championships, Anna Voloshyna (UKR) and Lolita Ananasova (UKR) claimed the first medal for Ukraine in this event, finishing third.
· Ukraine improved on their final ranking in each the five FINA World Championships, the duet free routine has been held. The duos finished eighth in 2007, seventh in 2009, sixth in 2011, fourth in 2013 and third in 2015.
· At the 2015 FINA World Championships, Spain failed to claim a medal in the duet free routine for the first time. It claimed silver in this event in 2007 and 2009 and bronze in 2011 and 2013.