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London - Allyson Felix won her 16th world career medal on Sunday, producing as she has on some many occasions before a blistering run to help the United States to gold in the 4x400m relay.
Felix ran an outstanding second lap, clocked at a startling 48.7 seconds, as the quartet, also comprising Quanera Hayes, Shakima Wimbley and newly-crowned 400m champion Phyllis Francis, timed 3.19.02.
Britain, in 3:25.00, held off Poland (3:25.41) for silver.
Jamaica's sprinting woes continued as their foursome failed to make it around after Anneisha McLaughlin-Whilby pulled up on the second leg and had to be taken off the track in a wheelchair.
Felix's gold in the shorter relay on Saturday saw her overtake Jamaicans Merlene Ottey and Usain Bolt as the record world medal holder.
The 31-year-old also won a bronze in the 400m and of her 16 world medals, 11 have been gold, while nine in total were won as part of the US relay team and seven individually.
Felix has also bagged an incredible nine Olympic medals including six gold.
"It does mean so much to me every time," Felix said when asked whether medals motivated her.
"I love this sport. I'm grateful to run with these amazing girls. They work so hard and deserve all their success.
"It's an honour to run in the relay for Team USA and I will always treasure these moments."
Felix kicked off her incredible medal haul with a 200m silver medal at the 2004 Olympics in Athens, her first global gold coming in the 200m at the Helsinki world champs a year later.
Results from the 10th and final day of the World Athletics Championships on Sunday (finals only):
Men
1500m
1. Elijah Motonei Manangoi (KEN) 3min 33.61sec
2. Timothy Cheruiyot (KEN)
3. Filip Ingebrigtsen (NOR) 3:34.53
4. Adel Mechaal (ESP) 3:34.71
5. Jakub Holusa (CZE) 3:34.89
6. Sadik Mikhou (BRN) 3:35.81
7. Marcin Lewandowski (POL) 3:36.02
8. Nicholas Willis (NZL) 3:36.82
9. Asbel Kiprop (KEN) 3:37.24
10. John Gregorek (USA) 3:37.56
4x400m relay
1. Trinidad and Tobago (Jarrin Solomon, Jereem Rchards, Machel Cednio, Lalonde Gordon) 2min 58.12sec
2. United States 2:58.61
3. Britain 2:59.00
4. Belgium 3:00.04
5. Spain 3:00.65
6. Cuba 3:01.10
7. Poland 3:01.59
8. France 3:01.79
High jump
1. Mutaz Essa Barshim (QAT) 2.35 metres
2. Danil Lysenko (ANA - neutral) 2.32
3. Majd Eddin Ghazal (SYR) 2.29
4. Edgar Rivera (MEX) 2.29
5. Mateusz Przybylko (GER) >
8. Bryan McBride (USA) 2.25
9. Bohdan Bondarenko (UKR) 2.25
10. Eike Onnen (GER) 2.20
20km walk
1. Eider Arevalo (COL) 1hr 18min 53sec, 2. Sergei Shirobokov (ANA - neutral) 1hr 18:55, 3. Caio Bonfim (BRA) 1hr 19:04, 4. Lebogang Shange (RSA) 1hr 19:18, 5. Christopher Linke (GER) 1hr 19:21, 6. Dane Bird-Smith (AUS) 1hr 19:28, 7. Kaihua Wang (CHN) 1hr 19:30, 8. Alvaro Martn (ESP) 1hr 19:41, 9. Alberto Amezcua (ESP) 1hr 19:46, 10. Miguel Angel Lopez (ESP) 1hr 19:57
50km walk
1. Yohann Diniz (FRA) 3hr 33:12, 2. Hirooki Arai (JPN) 3hr 41:17, 3. Kai Kobayashi (JPN) 3hr 41:19, 4. Igor Glavan (UKR) 3hr 41:42, 5. Satoshi Maruo (JPN) 3hr 43:03, 6. Mate Helebrand (HUN) 3hr 43:56, 7. Rafal Augustyn (POL) 3hr 44:18, 8. Robert Heffernan (IRL) 3hr 44:41, 9. Marco De Luca (ITA) 3hr 45:02, 10. Carl Dohmann (GER) 3hr 45:21
Women
800m
1. Caster Semenya (RSA) 1min 55.16sec
2. Francine Niyonsaba (BDI) 1:55.92
3. Ajee Wilson (USA) 1:56.65
4. Margaret Wambui (KEN) 1:57.54
5. Melissa Bishop (CAN) 1:57.68
6. Angelika Cichocka (POL) 1:58.41
7. Charlene Lipsey (USA) 1:58.73
8. Lynsey Sharp (GBR) 1:58.98
4x400m relay
1. United States (Quanera Hayes, Allyson Felix, Shakima Wimbley, Phyllis Francis) 3min 19.02
2. Britain 3:25.00
3. Poland 3:25.41
4. France 3:26.56
5. Nigeria 3:26.72
6. Germany 3:27.45
7. Botswana (3:28.00
DNF - Jamaica
Discus
1. Sandra Perkovic (CRO) 70.31 metres
2. Dani Stevens (AUS) 69.64
3. Melina Robert-Michon (FRA) 66.21
4. Yaime Perez (CUB) 64.82
5. Denia Caballero (CUB) 64.37
6. Nadine Muller (GER) 64.13
7. Xinyue Su (CHN) 63.37
8. Bin Feng (CHN) 61.56
20km walk
1. Jiayu Yang (CHN) 1hr 26:18, 2. Maria Guadalupe Gonzalez (MEX) 1hr 26:19, 3. Antonella Palmisano (ITA) 1hr 26:36, 4. Erica de Sena (BRA) 1hr 26:59, 5. Sandra Arenas (COL) 1hr 28:10, 6. Ana Cabecinha (POR) 1hr 28:57, 7. Kimberly Garcia (PER) 1hr 29:13, 8. Wang Na (CHN) 1hr 29:26, 9. Laura Garcia-Caro (ESP) 1hr 29:29, 10. Maria Perez (ESP) 1hr 29:37
50km walk
1. Ines Henriques (POR) 4hr 05:56, 2. Hang Yin (CHN) 4hr 08:58, 3. Shuqing Yang (CHN) 4hr 20:49, 4. Kathleen Burnett (USA) 4hr 21:51.
Note: Only four of seven starters finished.
