Women's 100m Freestyle
· The Campbell sisters have won the last two 100m freestyle world titles, as Cate Campbell (AUS) won in 2013 and younger sister Bronte Campbell (AUS) in 2015.
· Bronte Campbell is hoping to become the second woman to successfully defend the world title in this event, after Kornelia Ender (GDR) won the first two editions in 1973 and 1975.
· Ender is also the only woman who has won the 100m freestyle on multiple occasions at the World Championships.
· Cate Campbell, current world record holder, will not be participating in the 2017 World Championships.
· Simone Manuel (USA) and Penny Oleksiak (CAN) shared the win in this event at the Rio 2016 Olympic Games.
· They could follow in the footsteps of Britta Steffen (GER), Jodie Henry (AUS) and Inge de Bruijn (NED) in winning the 100m freestyle world title as the reigning Olympic champion. Steffen won in 2009 after taking gold at Beijing 2008, Henry won in 2005 after gold at Athens 2004 and De Bruijn won in 2001 after her gold at Sydney 2000.
· At Rio 2016, Oleksiak became the first ever athlete born after 1 January 2000 to claim an Olympic gold medal in an individual event in any sport.
· Oleksiak could claim Canada's first World Championships medal in the women's 100m freestyle.
· Ranomi Kromowidjojo (NED, G0-S0-B2) and Sarah Sjöström (SWE, G0-S2-B0) could both claim a record third medal in this event.
· United States (G2-S4-B2) and Netherlands (G1-S2-B5) have both claimed a record eight medals in this discipline, but have combined for only three wold titles - De Bruijn in 2001, Jenny Thompson (USA) in in 1998 and Nicole Haislett (USA) in 1991.
Men's 200m Backstroke
· At the FINA World Championships in Kazan in 2015, Mitchell Larkin (AUS) won the world title in the men's 200m backstroke.
· He ended a streak of eight consecutive world titles won by swimmers representing United States, a run that started in 1998.
· Larkin could become the third swimmer to win multiple world titles in this event, after Aaron Peirsol (USA, 4) and Ryan Lochte (USA, 3).
· United States (10) is the only country to have won multiple world titles in the men's 200m backstroke, with six countries all winning once.
· They are also the only country with more than a total of four medals in this event as US swimmers have claimed 18.
· The men's 200m backstroke at the United States Championships last month was won by Ryan Murphy (USA), who finished in fifth place in this event at the 2015 World Championships.
· That fifth place was the highest finish for a US swimmer in this event in 2015 - only once, United States missed out on the medals in this event at consecutive World Championships: 1986-1991.
· Murphy is the reigning Olympic champion from Rio in this event. The only reigning Olympic champions to have won this event at the first World Championships following the Olympic Games are Rolland Matthes (GDR, 1973) and Aaron Peirsol (2005).
· Radoslaw Kawecki (POL) finished second in the men's 200m backstroke at each of the last two World Championships. He could become the first swimmer with three silver medals in this event.
· Prior to Kawecki's second places, Ryosuke Irie (JPN) finished in second place in both 2009 and 2011. At the last two World Championships, he just missed out on the podium as he finished fourth on both occasions.
· Adam Telegdy (HUN) and Benjamin Gratz (HUN) hope to become the second and third swimmers to claim a medal in this event in front of a home crowd, after Evgeny Rylov (RUS, bronze) in Kazan in 2015.
Men's 200m Breaststroke
· At the 2015 FINA World Championships in Kazan, Marco Koch (GER) won the world title in the men's 200m breaststroke, ending Dániel Gyurta's (HUN) winning streak of three consecutive world titles in this event.
· Koch could become the third swimmer to claim successive world titles in this event, after Gyurta (2009, 2011, 2013) and David Wilkie (GBR, 1973-1975).
· Koch needs a bronze medal to complete his medal set in the men's 200m breaststroke, becoming the second swimmer to achieve this after Norbert Rózsa (HUN).
· Germany could become the fifth country with multiple world titles in this event, after United States (5), Hungary (5), Japan (2) and Great Britain (2).
· United States' last gold medal in this event came in Montreal in 2005, when Brendan Hansen (USA) won the world title.
· Kevin Cordes (USA), who finished in second place behind Koch at the 2015 World Championships, won the men's 200m breaststroke at the US trials last month.
· Anton Chupkov (RUS) won this event at each of the last two Mare Nostrum meets, in Barcelona (14 June) and Canet-en-Roussillon (18 June). No swimmer representing Russia has claimed a medal in this event at the World Championships.
· Dmitriy Balandin (KAZ) won the Olympic title in this event at the 2016 Olympic Games in Rio. Only one reigning Olympic champion won this event at the first World Championships following the Olympic Games, Dániel Gyurta in 2013.
· Coming into these World Championships, no swimmer representing Kazakhstan has claimed a medal in any swimming event at the World Championships.
· Yasuhiro Koseki (JPN) could become the first Japanese swimmer to claim a medal in this event since Kosuke Kitajima (JPN) in 2011 (silver).
Women's 200m Breaststroke
· Reigning Olympic champion, Rie Kaneto (JPN), and reigning world champion, Kanako Watanabe (JPN), in the women's 200m breaststroke will not be participating at the 2017 World Championships.
· Yuliya Efimova (RUS) claimed the silver medal in this event at the Rio 2016 Olympic Games. She won the 200m breaststroke world title in 2013 and could equal Ágnes Kovács (HUN) and Leisel Jones (AUS) on a record two wins in this discipline.
· Efimova also claimed a silver medal in the 200m breaststroke, in 2011, and could equal Jones (G2-S1-B0) on a record three medals in this event.
· Rikke Pedersen (DEN) can also achieve this as she has claimed one silver and one bronze medal in the 200m breaststroke.
· Pedersen is the holder of the world record (2:19.11) which she swam in her semifinal race at the 2013 World Championships.
· Two years ago, five women finished on the podium in the 200m breaststroke as Pedersen, Jessica Vall (ESP) and Shi Jinglin (CHN) shared third place.
· Shi could become the second Asian woman to win this event at the World Championships after Watanabe's victory in 2015. She claimed the bronze medal at the Rio 2016 Olympic Games.
· Australia could win the women's 200m breaststroke event for a record fourth time at the World Championships, surpassing the Soviet Union and East Germany which were both on three.
Women's 4 x 200m Freestyle Relay
· United States have won a record six world titles in the women's 4x200m freestyle relay.
· United States have won their six titles in the last seven editions of the World Championships (2003-2015), failing to do so only in 2011 when China claimed the win.
· Chelsea Chenault (USA) and Katie Ledecky (USA) have won two world titles in this event. Compatriots Katie Hoff (USA) and Missy Franklin (USA) on a record three world titles in this event.
· Team US has finished on the podium in 10 of the previous 12 times this discipline was on the programme at the World Championships, missing out only in 1991 and 2001.
· United States have also won this event at five of the previous six Olympic Games (1996-2016). Only in 2008 they failed to win the gold medal as Australia won ahead of China (silver) and United States (bronze).
· Australia have finished on the podium in this event on five occasions (G0-S4-B1), but never succeeded to win the title.
· Canada took home the bronze medal in the 4x200m freestyle relay at the Rio 2016 Olympic Games. Their best result at the World Championships is a fourth place, in both 1998 and 2001.