Williams turned back the challenge of Dutchwoman Lisanne de Witte and Switzerland’s Annina Fahr to win in 50.58, her second fastest time this season, trailing behind her 50.56 to finish second at Jamaica’s National Championships in June.
De Witte and Fahr’s times in second and third were 51.99 and 52.08, respectively.
Richards, the 2017 World Championship bronze medallist and two-time Commonwealth Champion, all in the 200m, won the half-lap event on Tuesday in 20.19 ahead of the Zimbabwean pair Makanakaishe Charamba (20.42) and Tapiwanashe Makarawu (20.48).
The 30-year-old Trinidadian will also compete in the 400m in Paris. He won gold in the distance at the World Indoor Championships in 2022.
Another Jamaican Olympian, Lanae-Tava Thomas, was narrowly beaten by the Ivory Coast’s Jessika Gbai in the 200m.
Gbai’s winning time of 22.57 just beat out Thomas’s 22.60 while Switzerland’s Mujinga Kambundji was just behind in third in 22.61.
Kemba Nelson ran 11.21 to finish third overall in the women’s 100m behind New Zealand’s Zoe Hobbs (11.17) and Kambundji (11.20).
Broadbell ran 13.36 to win the 110m hurdles ahead of Americans Eric Edwards (13.53) and Jamal Britt (13.54). Olympic champion Hansle Parchment was fourth in 13.54.
The 22-year-old Broadbell has now won his last five races, including a personal best 12.99 to win at the Lausanne Diamond League last Friday.
In the B-final, Jamaica’s National U-20 record holder Damion Thomas was third in 13.71 behind Japan’s Izumiya Shunsuke (13.61) and American Robert Dunning (13.55).
In the Women’s 100m hurdles, Olympic champion Jasmine Camacho-Quinn of Puerto Rico ran 12.86 for second behind the USA’s Tia Jones (12.78). Jones’ teammate Tonea Marshall was third in 13.04.
In -2.0 second winds, Thompson-Herah ran 11.30 to narrowly finish behind Richardson (11.29). The USA’s Celera Barnes ran 11.40 for third.
Jamaica’s Natasha Morrison was victorious in the B-final in 11.42 ahead of Egypt’s Bassant Hemida (11.44) and Gambia’s Gina Bass (11.50).
On the Men’s side, World Championship semi-finalist Ackeem Blake ran 10.22 for third behind Commonwealth champion Ferdinand Omanyala of Kenya (10.18) and American World Championship silver medallist Marvin Bracy (10.17).
Walcott produced a best throw of 84.82m in the fifth round to take the win ahead of Latvian Patriks Gailums (83.30m) and Curtis Thompson of the USA (82.87m).
Bahamian Anthonique Strachan won the Women’s 200m in 22.66 ahead of Aminatou Seyni of Niger (22.71) and Jenna Prandini of the USA (22.82).
On the Men’s side, recently crowned NACAC champion Andrew Hudson of Jamaica was second in 20.47 behind the USA’s Kyree King (20.40). Charlie Dobson of Great Britain was third in 20.52.
Commonwealth Games champion Janieve Russell ran 55.25 for second in the Women’s 400m hurdles behind American Dalilah Muhammad (54.57). Finland’s Viivi Lehikoinen was third in 55.41.
