WATCH LIVE: 2019 Ironman Kona World Championships

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The Ironman Kona World Championships — a grueling 140.6-mile triathlon in sweltering Hawaii — stream live on and the NBC Sports app on Saturday.

A year after shattering course records, German Patrick Lange and Swiss Daniela Ryf defend their world titles.

The men’s race starts at 6:25 a.m. local time (12:25 p.m. ET) with the 2.4-mile swim. The women start in Kailua Bay water five minutes later. The swim is followed by a 112-mile bike on the Queen Ka’ahumanu Highway and then a marathon to the Kona finish line.

The fastest triathletes will complete the course in eight hours.

NBCSN coverage runs from noon-2 p.m. ET. NBC and NBCSN will also have occasional check-ins throughout the afternoon, culminating with finish coverage around 8:30 p.m. ET.

On Sunday, NBCSN will air a recap show from 2-3 p.m. ET.

WATCH LIVE: Ironman Kona World Championships, 12:25 p.m. ET — STREAM LINK

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