Korir, who was the first man to finish in last year's Bay to Breakers competition as well, arrived at Ocean Beach with a race time of 34 minutes 24 seconds.
Four seconds later, Ridouane Harroufi, a 26-year-old man from Morocco, finished the race with a time of 34 minutes 28 seconds. John Yuda, a 28-year-old from Tanzania, came in third among the men with a time of 35 minutes three seconds.
Lineth Chepkurui, a 20-year-old from Kenya, was the first female contestant to cross the finish line and had a time of 39 minutes 22 seconds. The next three female contestants to finish the race were Rose Kasgel, 26, Jane Kibii, 23, and Caroline Rotich, 24, all from Kenya.
Steve Sundell, a 26-year-old Redwood City man, was the first American man and Bay Area resident to complete race, finishing seventh among the men with a time of 36 minutes 21 seconds. He was followed by Peter Gilmore, a 31-year-old San Mateo man, who completed the race in 36 minutes 44 seconds.
Kathleen Trotter, a 23-year-old Palo Alto resident, was the first American woman to cross the finish line, coming in fifth among the women and finishing the race in 42 minutes 13 seconds. Six seconds later, her twin sister Amanda Trotter crossed the finish line, coming in sixth among the women.
Clara Peterson, a 24-year-old Stinson Beach resident, was the 10th female contestant to cross the finish line.
Bay to Breakers organizers reported that an estimated 60,000 people, many in costumes, attended today's event, which travels through the city, beginning at the Embarcadero and ending at Ocean Beach. There were about 33,000 registered runners, according to the organizers.
The San Francisco police and fire departments this morning reported no major incidents in connection with the race.