Olympic 800m champion Emmanuel Wanyonyi fell to Canada's Marco Arop after finishing second to Arop during Sunday's Silesia Diamond League.
Wanyonyi clocked 1:43.23 with Arop posting a winning time of 1:41.86. USA's Bryce Hoppel placed third in 1:43.32 while Wycliffe Kinyamal was fifth with a time of 1:43.54.
On Friday, Wanyonyi had outpaced Arop at the Lausanne Diamond League, setting a world-leading time of 1:41.11, with Arop trailing at 1:41.72.
In the men's 3,000m steeplechase, Morocco's Olympic champion Soufiane El Bakkali narrowly edged out Amos Serem at the line on the line with both athletes finishing with 8:04.29.
Ethiopia's Samuel Firewu (8:04.34) placed third with Olympic bronze medallist Abraham Kibiwot (8:08.21)fourth.
Meanwhile, history was rewritten in the 3,000m as Olympic 5,000m champion Jakob Ingebrigtsen shattered Daniel Komen's 28-year-old world record.
Ingebrigtsen clocked an astonishing 7:17.55, breaking Komen's 1996 mark of 7:20.67 set in Italy.
The Norwegian sensation holds the 2,000m world record with a time of 4:43.13 set last year in Brussels as well as the indoor 1,500m record with a time of 3:30.60 set in 2022.
In Silesia, Ethiopian's Berihu Aregawi (7:21.28), Yomof Kejelcha (7:28.44) and Talehun Bekele (7:30.91) claimed positions two through to fourth with Olympic 5,000m silver medallist Ronald Kwemoi (7:31.57) settling for fifth place.
The other Kenyan, Nicholas Kipkorir placed ninth with a time of 7:33.56.
In the women's 1,500m, Susan Ejore missed out on the top three after placing seventh with a time of 3:59.97.
Ethiopians Diribe Welteji (3:57.08) and Freweyni Hailu (3:57:88) finished first and second with Britain's Georgia Bell (3:58.11) finishing third.
