JOIN USCaster Semenya put her run-in with the IAAF over controversial new rules on testosterone firmly to one side as she scorched to the fourth-fastest time ever run in the women's 800m at Diamond League meet in Paris.
There was also an outstanding performance by Qatar's Abderrahman Samba, who set the second-fastest time ever in the men's 400m hurdles in balmy conditions of 29 degrees Celsius (84F) at the Charlety stadium in southern Paris.
Semenya, double Olympic champion (2012, 2016) and twice world champion (2009, 2017), completely dominated her two-lap sortie, leading from gun to tape to clock a scintillating 1min 54.25sec that left the large crowd gasping.
Only Kenyan Pamela Jelimo, in Zurich in 2008, Soviet Union's Nadezhda Olizarenko in 1980 and Czech world record holder Jarmila Kratochvilova (1:53.28), in 1983, have gone faster.
"In Oslo we weren't happy with the pace and we said no pace setters this time around," Semenya said.
Semenya was initially tracked by Burundi's Olympic silver medallist and reigning world champ Francine Niyonsaba and American Ajee Wilson.
The 27-year-old South African hit the bell in a swift 56.12sec, gradually pulling away down the back straight before turning the screw from 200m and not letting up through to the line, maintaining her unbeaten form over the 800m since her elimination in the semifinals of the 2015 worlds in Beijing.
Unstoppable Samba
Naturalised Qatari Samba carried on his remarkable start to the season, scorching to the second fastest time ever over the gruelling event.
His 46.98sec winning time edged him ever closer to the world record of American Kevin Young set back in 1992. It also beat the season's best of 47.02 set by Antigua's Rai Benjamin, who opted to run the 200m in Paris.
Samba's 20-year-old rival Benjamin clocked a personal best of 19.99sec in the 200m behind American world indoor 400m record holder Michael Norman, who clocked an admirable 19.84sec after two false starts.
Ronnie Baker wrapped up the sprints for the US team, timing a personal best of 9.88sec as France's Jimmy Vicaut, China's Su Bingtian and South African Akani Simibine all went sub-10sec.
Sergey Shubenkov, the current world champion from Russia and the only athlete to have run a sub-13sec time this year, was harshly ruled to have false started in the 110m hurdles, Jamaican Ronald Levy going on to win in 13.18sec.
There was no such drama, however, for reigning Olympic champions Sandra Perkovic of Croatia and Colombian Caterine Ibarguen, who claimed victories in the women's discus (with a meet record of 68.60m) and triple jump (14.83m) respectively.
The women's high jump saw Russia's defending double world champion Mariya Lasitskene seal an incredible 44th consecutive victory with a season's best of 2.04m, going very close at 2.08.
Belgium's Nafissatou Thiam, the Olympic and world heptathlon gold medallist, was second with 2.00m.
Renaud Lavillenie's hopes of pleasing the home crowd fell flat after the world record holder could only finish third in a pole vault competition won by American Sam Hendricks with 5.90m on count-back from 18-year-old Swede Armand Duplantis in second.
Lavillenie's teammate Kevin Mayer won a four-man triathlon comprising a long jump, shot put and 110m hurdles, but there were tears for sprinter Christophe Lemaitre, who pulled up injured in his bid to make the 10.15sec qualifying time to compete in the 100m in August's European championships in Berlin.