I agree with Wejo, Phenom Man, and Windblows. Boston's race this year was phenomenal - I'm sorry that neither the televised coverage nor Youtube videos of the race are available in South America (due "copyright issues"). So, after adding my congrats to all the top men and women finishers, and after agreeing with the above posters' comments, let me add the following for consideration:
1. Here's the website Wejo referred to but forgot to post:
http://www.sportsscientists.com/
2. Four weeks before the Boston Marathon, Ryan Hall ran the New York City 1/2 marathon in 1:03:53. A mere four weeks later, Hall put together back-to-back half-marathons of 1:01:58/1:03:00. (!!)
3. Moses Mosop has 10k/half-marathon bests of 26:49/59:20. Haile Gebrselassie has 10k/half-marathon bests of 26:22/58:55. Yet in Mosop's FIRST marathon ever, he ran a full 53 seconds FASTER than Gebrselassie's WORLD RECORD (the latter achieved after four years of intense world record attempts on flat courses).
4. Fastest downhill mile by elite athlete = Steve Scott, 3:31.25 in Auckland, New Zealand in April 1982.
Fastest downhill mile ever run = Craig Wheeler, 3:24, run at the Meltham Mile, UK, 1993.
http://www.independent.co.uk/sport/maniacs-stand-out-a-mile-1251620.html
However, the WORLD RECORD for the mile is Hicham El Guerrouj's 3:43.13
5. Geoffrey Mutai ran two high quality, rabbited races on flat, fast courses in 2010. In Rotterdam he ran 2:04:55 and in Berlin he ran 2:05:10. In Boston he ran 1:01:58/1:01:04 for a 2:03:02.
5. In 1994, Boston had a heavy tailwind and the times were all fast, including Bob Kempainen's, who ran 2:08:47. The 2nd fastest marathon of his ENTIRE CAREER turned out to be a nearly four minutes slower, 2:12:45. The winner that year, Cosmos Ndeti, also ran a career best by over two minutes (2:07:15) that day.
6. In 1983, Boston had a heavy tailwind. Greg Meyer ran a career best by almost two minutes (2:09:00) (2nd best being 2:10:59). Ron Tabb in 2nd ran a career best by a minute (2:09:32). Also on that windy day, Joan Benoit beat the WORLD RECORD by almost THREE minutes (2:22:43 vs. Grete Waitz's 2:25:29)
Given all of these data, it's obvious that the wind was not a negligible factor at Boston on Monday (just as it wasn't in 1983 or 1994). That's one of two reasons why point to point courses are not eligible for record purposes (the other reason being that point to point courses can have net downhill drops - which is certainly the case at Boston).
Boston's race on Monday produced the fastest marathon ever run. But it did not produce either a world record or American record.