Moses Mosop said his fitness level was only 80 percent of optimal because of training time lost to an Achilles tendon injury. After the Kenyan’s performance in Sunday’s Bank of America Chicago Marathon, one can only imagine what he would could do if 100 percent healthy.

In his Chicago debut, the 26-year-old Mosop clocked 2 hours, 5 minutes, 37 seconds, breaking the late Sammy Wanjiru’s course record of 2:05:41.

Liliya Shobukhova became the first runner to win a third straight Chicago Marathon title. In winning the women’s race, she lowered her personal best, which was the national record. And she got both legs up on a place in Russia’s Olympic team at the 2012 Olympics.

Running alone for nearly the entire second half of the race, the 33-year-old from Beloretsk in the Ural Mountains became the second fastest woman in history with a time of 2 hours, 18 minutes, 20 seconds.

Mosop reacted to a surge by compatriot Wesley Korir in the 19th mile by covering the move, surging himself and immediately tearing apart the field.

He rattled off miles of 4:40, 4:37, 4:38, 4:40 and 4:39 before slowing in the final three miles but hanging on for the record, a first prize of $100,000 and record bonus of $50,000.

Mosop led a Kenyan podium sweep. Korir was second in 2:06:16 and Bernard Kipyego third in 2:06:29.

Ryan Hall of the United States fell off the pace midway through the race and took fifth in an unimpressive 2:08:04.

Aided by a tailwind on a downhill, point-to point course in Boston, Mosop had made his marathon debut in April with a second-place finish in 2:03:06.