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Setting personal-best marks in two of five events Wednesday, Zach Ziemek of Itasca sits in seventh place after the first day of the men’s decathlon.
USA’s Zach Ziemek high jumps during the decathlon, Aug. 4, 2021, at Olympic Stadium. (Brian Cassella / Chicago Tribune)

USA’s Zach Ziemek prepares to start the 400-meter race during the decathlon on Aug. 4, 2021. (Brian Cassella / Chicago Tribune)

USA’s Zach Ziemek prepares to high jump during the decathlon, Aug. 4, 2021, at Olympic Stadium. (Brian Cassella / Chicago Tribune)

USA’s Zach Ziemek finishes the 400-meter race during the decathlon on Aug. 4, 2021. (Brian Cassella / Chicago Tribune)

USA’s Zach Ziemek, of Itasca, prepares to start the 400-meter race during the decathlon on Aug. 4, 2021. (Brian Cassella / Chicago Tribune)