Pakistan, April 22 -- Defending champion John Korir broke the Boston Marathon course record on Monday, riding a tailwind to outrun the fastest field in event history and win in an unofficial 2 hours, 1 minute, 52 seconds for his second straight victory. The Kenyan broke away from the pack as it headed into Heartbreak Hill in Newton and opened a 40-second lead, peeking behind him as he went through Kenmore Square with a mile to go. He beat the 2:03:02 set by Geoffrey Mutai in 2011 by 1:10.

Kelvin Kiptum holds the marathon world record, with a 2:00:35 on the flatter Chicago course in 2023.

The runners in the women's race were still on the course. Marcel Hug of Switzerland won his ninth wheelchair title in 1:16:06, missing his own course r...