Karoki, a two-time Olympian in the 10,000m, is an exciting athlete who made his marathon debut in 2017.

Prior to jumping to the marathon, he spent nearly a decade polishing his speed on the track, representing Kenya three times in the 10,000m at the IAAF World Championships.

"I still need to learn more in marathon. But I have high hopes of doing well in Chicago. Training is going on well with no injury concerns," said Karoki.

Kipkemoi boasts the 25th fastest time in history over the half marathon distance, 59:01, and he started 2018 with a successful marathon debut, running 2:05:44 to win the Rotterdam Marathon.

On the other hand, Lonyangata missed a spot in the top three in Chicago in 2016, coming home in fourth after enduring uneven pace swings.

He set his personal best, 2:06:10, while winning the 2017 Paris Marathon, and he welcomed 2018 by becoming the first back-to-back winner of the Paris Marathon in nearly two decades.

However, Kirui experienced a significant career breakthrough when he won the laurel wreath at the 2017 Boston Marathon, shaking off American Galen Rupp to victory.

That win set him up for the 2017 IAAF World Marathon Championships, where he was eighth.

Kirui returned to Boston in to defend his title in April, but he failed to match the strides of a hard charging Yuki Kawauchi and he was forced to settle for second.

October marks Kirui's second attempt in Chicago, where he had made his marathon debut in 2017, but he dropped out of the race.

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