List of World Championships records in swimming
Men
Legend: # – Record awaiting ratification by FINA; WR – World record; AF – African record; AM – Americas record; ER – European record; OC – Oceanian record; Records not set in finals: h – heat; sf – semifinal; r – relay 1st leg; rh – relay heat 1st leg

List of World Championships records in swimming

Section Title: Men
Table Section Text: Legend: # – Record awaiting ratification by FINA; WR – World record; AF – African record; AM – Americas record; ER – European record; OC – Oceanian record; Records not set in finals: h – heat; sf – semifinal; r – relay 1st leg; rh – relay heat 1st leg

Event	Time	Name	Nationality	Date	Meet	Location	Ref

50m freestyle	21.08	César Cielo Filho	Brazil	1 August 2009	2009 World Championships	Rome, Italy

100m freestyle	46.91	WR	César Cielo Filho	Brazil	30 July 2009	2009 World Championships	Rome, Italy

200m freestyle	1:42.00	WR	Paul Biedermann	Germany	28 July 2009	2009 World Championships	Rome, Italy

400m freestyle	3:40.07	WR	Paul Biedermann	Germany	26 July 2009	2009 World Championships	Rome, Italy

800m freestyle	7:32.12	WR	Zhang Lin	China	29 July 2009	2009 World Championships	Rome, Italy

1500m freestyle	14:34.14	Sun Yang	China	31 July 2011	2011 World Championships	Shanghai, China

50m backstroke	24.04	Liam Tancock	Great Britain	2 August 2009	2009 World Championships	Rome, Italy

100m backstroke	52.19	r	Aaron Peirsol	United States	2 August 2009	2009 World Championships	Rome, Italy

200m backstroke	1:51.92	WR	Aaron Peirsol	United States	31 July 2009	2009 World Championships	Rome, Italy

50m breaststroke	25.95	sf, WR	Adam Peaty	Great Britain	25 July 2017	2017 World Championships	Budapest, Hungary

100m breaststroke	57.47	Adam Peaty	Great Britain	24 July 2017	2017 World Championships	Budapest, Hungary

200m breaststroke	2:06.96	Anton Chupkov	Russia	28 July 2017	2017 World Championships	Budapest, Hungary

50m butterfly	22.67	Milorad Čavić	Serbia	27 July 2009	2009 World Championships	Rome, Italy

100m butterfly	49.82	WR	Michael Phelps	United States	1 August 2009	2009 World Championships	Rome, Italy

200m butterfly	1:51.51	WR	Michael Phelps	United States	29 July 2009	2009 World Championships	Rome, Italy

200m individual medley	1:54.00	WR	Ryan Lochte	United States	28 July 2011	2011 World Championships	Shanghai, China

400m individual medley	4:05.90	Chase Kalisz	United States	30 July 2017	2017 World Championships	Budapest, Hungary

4×100m freestyle relay	3:09.21	(47.78)Michael Phelps (47.03)Ryan Lochte (47.61)Matt Grevers (46.79)Nathan Adrian	United States	26 July 2009	2009 World Championships	Rome, Italy

4×200m freestyle relay	6:58.55	WR	(1:44.49)Michael Phelps (1:44.13)Ricky Berens (1:45.47)David Walters (1:44.46)Ryan Lochte	United States	31 July 2009	2009 World Championships	Rome, Italy

4×100m medley relay	3:27.28	WR	(52.19)Aaron Peirsol (58.57)Eric Shanteau (49.72)Michael Phelps (46.80)David Walters	United States	2 August 2009	2009 World Championships	Rome, Italy

Sentence(s)

In his first event, the 100-meter backstroke, Peirsol won a championship.

final_sentence: In his first event, the 100-meter backstroke, Peirsol won a championship.